Short answer: the best full face mountain bike helmets for downhill are the ones that carry a downhill certification, carry rotational-impact protection, and fit your head shape before anything else. In this roundup of 12 helmets, the Demon United Podium Full Face takes our top slot on volume of rider feedback and all-round usefulness, the Troy Lee Designs Stage is the pick if you want the lightest full-face package with MIPS, and the Bell Servo is the one to buy when a full-face shell matters more than racing credentials.
I have been sorting through full-face lids for downhill, bike park and enduro riding for years, and the same three questions decide almost every purchase: does it carry a downhill certification, will it rotate safely on an oblique impact, and will the padding suit your head shape. Everything else is weight, venting and price. The research behind this list runs the same way — we pulled the manufacturer spec sheets for every model, cross-checked the stated certifications, and read a large volume of owner reviews rather than trusting marketing copy.
Two things worth saying up front. First, a full-face helmet is not automatically better than an open-face lid if the protection claim is vague, and several helmets sold in this category carry no published certification at all. Second, the weight figures published for these helmets are inconsistent, with some listings giving the bare shell and others giving the retail box weight. Where that happens I flag it rather than quietly picking the flattering number.
Our methodology is laid out in full further down, along with a certification explainer, a head-measuring walkthrough, and advice on what to do with a helmet after a crash.
Table of Contents
Top 3 Picks for Best Full Face Mountain Bike Helmets for Downhill (October 2026)
Best Full Face MTB Helmets Compared Side by Side in 2026
The table below is the fastest way to narrow the field. Every weight figure is quoted from the manufacturer listing, and where that listing is inconsistent I note it in the product section rather than the table.
| Product | Specifications | Action |
|---|---|---|
| Demon United Podium Full Face |
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Check Latest Price |
| Troy Lee Designs Stage |
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Check Latest Price |
 Smith Mainline |
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Check Latest Price |
 Fox Racing Dropframe Pro |
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Check Latest Price |
 Bell Sanction 2 |
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Check Latest Price |
 Demon Podium X MIPS |
|
Check Latest Price |
 Demon Podium Full Face MIPS |
|
Check Latest Price |
 OutdoorMaster Full Face |
|
Check Latest Price |
 Bell Full 9 Fusion MIPS |
|
Check Latest Price |
 Bell Servo Full Face |
|
Check Latest Price |
 O’Neal Sonus Deft |
|
Check Latest Price |
 Fox Racing Speedframe |
|
Check Latest Price |
1. Demon United Podium Full Face: The Best All-Round Full Face Buy
Demon United Podium Full Face Helmet Grey/Blue XL
2.2 lb listed shell weight
13 air flow vents
Removable washable liner
Pros
- Light at 2 lb 2 oz for a full-face shell
- Removable washable liner
- Snug large and extra-large sizing
- Removable visor on aluminium side screws
Cons
- No safety certification listed on the shell
- Runs hot in warmer months
- Limited impact foam between shell and head
This is the helmet I keep coming back to because the feedback base is enormous. More than a thousand riders have left a rating, and the pattern in those reviews is remarkably consistent: people buy it for the weight, stay for the fit, and several report it absorbing genuinely serious hits.
The shell is injection-moulded thermal alloy resin polycarbonate over an expanded polystyrene liner that is described as conforming to head shape. That claim matters more than it sounds, because EPS is moulded to a shape and if your head is long or flat the liner will either gap or crush the temples.
At 2 lb 2 oz this is not a featherweight, but it sits in the middle of the class and the 13 air flow vents do a reasonable job of moving air through the shell on a lift-served run. The removable washable liner is the feature that converts first-time buyers, because it can be rinsed after a muddy park day instead of festering.
The honest weakness is certification. Nothing in the listing names ASTM F1952, EN 1078 or CPSC, and that absence is not something to gloss over. Buy this one for park riding and general full-face protection, but if you are racing or your local park demands proof of downhill certification, keep looking.
Owners also mention that the extra-large size can run slightly loose for certain head shapes, so measure before you commit.
Who this helmet suits
Riders who want chin and jaw coverage without carrying a race-weight lid, and who ride in mixed weather rather than exclusively in the cold. If your days are lift laps, forest roads and the odd pump track, this is a comfortable place to start.
It also suits anyone replacing a cracked open-face and not ready to pay premium-brand money for the same shape of protection.
Where it falls short
The missing published certification is the main issue, followed by heat build-up on warm days. Riders who pedall long climbs or ride in summer heat will find the venting adequate rather than impressive.
If your head is genuinely difficult to fit, the extra-large size is generous but not adjustable, so a head shape that falls between sizes may not settle.
2. Troy Lee Designs Stage: The Best Lightweight Full Face With MIPS
Troy Lee Designs Stage Helmet Stealth Midnight MD/LG
About 690 g
MIPS with EPP and EPS
25 intake and exhaust ports
Pros
- Very light for a full-face shell
- MIPS with a low-speed EPP layer
- 25 ports for genuine airflow
- Reinforced chin bar with EXO-Skeleton structure
Cons
- Some buyers want tougher protection still
- Premium price for the category
- Small share of lowest ratings
The Stage is the pick for riders who take protection seriously and still notice the weight on their neck. At roughly 690 g according to the product’s own feature list, it is the lightest full-face in this roundup by a clear margin.
Be aware the listing carries two conflicting weight fields. The feature copy says approximately 690 g while a separate spec field reads 3.8 pounds. Treat the lighter figure as the shell weight and the heavier one as a packaged or retail figure, and check the size you are ordering before relying on either.
Protection here is a three-layer story. MIPS handles rotational motion, a low-speed EPP foam layer handles soft oblique knocks, and the EPS liner takes the hard straight impacts. That combination is the modern full-face arrangement and it is the reason this shell feels secure in a way a basic EPS-only lid does not.
The chin bar uses EXO-Skeleton reinforcement with breakaway visor screws, which matters because a visor that stays rigid can become a lever on the neck during a forward impact. Ventilation comes from 25 intake and exhaust ports, the highest genuine airflow claim in this group after the OutdoorMaster.
The single-star share in the reviews comes from people who wanted more protection, not less, which tells you the ceiling here is high but the margin is thin.
Who this helmet suits
Riders who race or ride park sessions that run long, and who feel every gram. It is the pick if you are moving up from an open-face and want rotational protection without a heavy, moto-derived shell on your head.
The Medium-Large size on this listing suits a broad range of adult heads and the graphics range is wide, which matters less but not at all.
Where it falls short
The price sits well above the budget options, and you are paying for the shell lightness and the MIPS layer rather than for extra certification. Reviewers who wanted tougher protection exist, so if you ride big bike park features a lighter shell is a compromise you should accept knowingly.
Venting is good for a full face but still not the same as an open shell on a hot climb.
3. Smith Mainline: The Best Multi-Certification Full Face
SMITH Mainline MTB Cycling Helmet – Matte Black, Small
Koroyd plus MIPS
CPSC EN1078 NTA8776 ASTM F1952
Three cheek pad kits
Pros
- Only helmet here listing four standards
- Full Koroyd coverage with MIPS
- Three washable cheek pad kits included
- Ionic plus lining controls odour
Cons
- Highest price in the roundup
- This listing is Small size only
- Listed weight of 380 g is not credible for a shell
Certification is where the Mainline separates itself. Its listing states compliance with CPSC, CE EN 1078, NTA8776 and ASTM F1952, which makes it the only helmet in this group where you can satisfy a race requirement and a park rule from a single purchase.
For rotational protection it pairs full Koroyd coverage with MIPS, so there are two independent systems working against twisting forces. Twenty-one fixed vents and an X-Static with Ionic plus lining handle heat and odour, which is the part riders mention first after the first hot session.
The fit customisation is unusually generous in the box. You get three washable cheek pad kits, two crown liners and two neck rolls, which is enough to tune the helmet to a long or flat head without buying extra parts later.
One thing to flag honestly: the listing weight reads 380 g. That figure cannot be right for a full-face downhill shell and almost certainly refers to a component or a mis-entered value. Ask for the size-appropriate weight before you order, and do not plan your purchase around the number on this page.
The visor adjusts into three positions, which is a small detail that stops it sitting in your line of sight on rough descents.
Who this helmet suits
Riders who race, ride at parks with strict certification rules, or simply want one helmet that satisfies every standard they will ever be asked about. It is also the strongest option here for anyone whose head shape does not suit a single set of stock pads.
If you ride through a full season and sweat a lot, the included lining and multiple pad kits reduce the reason to replace padding.
Where it falls short
Cost is the first limitation. This is the most expensive listing we reviewed, and you should be clear with yourself that the premium buys certification breadth, Koroyd and pad customisation rather than raw lightness.
Second, this particular listing is Small only. Riders with larger heads need another size option, and sizing across brands is not consistent enough to guess.
4. Fox Racing Dropframe Pro: The Best for Jaw and Cheek Coverage
Fox Racing Dropframe Pro Mountain Bike Helmet, Eucalyptus, Medium
MIPS with Varizorb liner
8 intake and 7 exhaust vents
Fidlock SNAP buckle
Pros
- Extended side and jaw coverage
- MIPS with dual-density Varizorb liner
- Fidlock SNAP buckle opens one-handed
- Large intake vents for airflow
Cons
- Runs a size small for several riders
- Fox sizing chart differs from other models
- Can feel warm in summer
The Dropframe Pro exists to wrap further down the sides of the head than a typical trail lid, and that is what it does. If your worry is a direct chin or cheek impact rather than a top-down hit, this is the geometry that addresses it.
Protection combines MIPS with a dual-density Varizorb EPS liner and additional fit pads. The dual-density approach places a softer layer against the head for low-energy hits and a harder layer deeper for the big one, so the helmet works across a wider range of impacts than single-density foam.
Ventilation is 8 big bore intake vents paired with 7 exhaust vents, and the fixed visor is positioned to sit in the airflow rather than block it.
The Fidlock SNAP buckle is a magnetic chin closure that can be opened one-handed. Forum riders consistently single out fiddly D-rings as a complaint among newer riders, and this solves that in a way a plastic quick-release cannot.
Who this helmet suits
Riders who hit the jump line hard and want chin and jaw coverage as their main priority. It is a strong all-mountain and enduro choice where you pedall as well as you descend.
The magnetic buckle is the detail that converts people who put helmets on and off repeatedly at a bike park car rack.
Where it falls short
Sizing is the biggest issue and it comes up more than anything else in the reviews. Several buyers had to size up because the shell runs small, and Fox uses a different sizing chart from some of its other models, so do not assume your usual size carries over.
Summer warmth is the second complaint, despite the vent count. Owners also report the helmet protecting them through serious crashes, which is a good sign for the shell itself.
5. Bell Sanction 2: The Best for Bike Park Laps
Bell Sanction 2 Adult Full-Face Bike Helmet – Matte Black – Size XL (59–61 cm)
CPSC ASTM downhill and BMX certified
14 vents
XX-Small to X-Large
Pros
- Certifies to CPSC ASTM downhill and BMX
- Ventilated DH air padding
- 14 vents spread across conditions
- Flying Bridge visor has no centre post
Cons
- Heaviest listed weight in the roundup
- Aluminium visor hardware adds mass
The Sanction 2 is Bell’s park and dirt answer and it is the pick for anyone who rides a lot of laps in a helmet rather than owning one racing shell. It certifies to CPSC, ASTM downhill and BMX, so it covers both the park and the pump track without argument.
Ventilation is the strongest part of the design. Fourteen vents feed ventilated DH air padding with removable washable cheek pads, which is the combination that keeps a rider comfortable through a long day when the helmet cannot be taken off.
The Flying Bridge visor improves airflow over the brow and adds material in a high-impact zone, and removing the centre post means there is one fewer piece to flex or crack. Owners describe strong downhill and park credentials and comfortable removable padding in the reviews.
The size range is genuinely useful here, running from XX-Small to X-Large, which makes this one of the easier helmets in the group to fit for a wide or narrow head.
The listed weight is 1.75 kg, which reads like a packaged figure rather than the shell alone. Even so it is among the heavier entries here, and the aluminium visor hardware contributes to that.
Who this helmet suits
Weekend bike park riders and dirt jumpers who want downhill certification without a race-day price. The XX-Small end of the range also makes it one of the few options here for smaller adult heads.
If you ride both park lines and pump track sessions, this covers both without a second purchase.
Where it falls short
Weight is the honest drawback, and riders who notice grams on long park days will feel it more than riders who buy one helmet a year.
The aluminium visor fixings are a second source of mass, and there is no magnetic buckle, so you are putting this one on and off with a conventional strap.
6. Demon Podium X MIPS: The Best Full Face for Large Heads
Demon United Podium X MIPS Full Face Mountain Bike Helmet- Removable Fit Pad Options- Advanced Venting System-Lightweight – Fullface DH BMX MTB Helmet (Cyan with Matte Black, Large/XLarge 59-61 CM)
710 g shell
MIPS layer
Small-Medium 55-58 cm and Large-XLarge 59-61 cm
Pros
- Light 710 g shell for a full face
- Two certified size ranges
- MIPS allows 10-15 mm of slide
- Multiple liner and cheek pad thicknesses
Cons
- No size below 55 cm
- Fit pads cannot change the certified size range
This is the option to look at if you measure towards the top of the range and keep getting squeezed by other brands. The Small-Medium covers 55-58 cm and the Large-XLarge covers 59-61 cm, and both are certified ranges rather than a loose guideline.
At 710 g it is the second-lightest full face in this roundup, and the MIPS layer is described as allowing 10-15 mm of multi-directional movement in angled impacts. That movement is the whole point of a slip plane, letting the shell rotate slightly rather than driving your skull sideways.
More than 20 ventilation ports are spread across the shell, and the fit is tuned with multiple liner and cheek pad thicknesses. Padding and the visor are both removable, which extends the life of the helmet considerably.
The honest limitation is at the bottom of the range. Nothing here goes below 55 cm, so riders with genuinely small heads are still underserved in this category.
Reviewers single out the low weight and the pad flexibility as the two things that make this one stand out, and those are exactly the things you notice on a long day.
Who this helmet suits
Riders with larger head circumferences who struggle to find a full face that fits, and anyone who wants MIPS protection without carrying a heavy shell. The two size ranges mean you are more likely to find a certified fit rather than a compromise.
Swap pads make it a good first full face too, because you can thin the liner out as you break the helmet in.
Where it falls short
The size floor is the clear problem. Riders under 55 cm have no option here, and even the Small-Medium starts higher than many open-face helmets do.
Fit pads change comfort but not the certified range, so they cannot rescue a head that is between the two certified sizes.
7. Demon Podium Full Face MIPS: The Best Value Full Face
DEMON UNITED Podium Full Face Mountain Bike Helmet Black Includes MIPS Technology (Large)
MIPS integrated
2 lb 2 oz listed
Screened mouth vent
Pros
- MIPS protection at an entry price
- Accurate size guide when measured
- Removable washable liner and cheek pads
- Helmet bag included
Cons
- Runs hot despite 13 vents
- Heavier feel on long rides
- No adjustment system so fit is unforgiving
This is the version of the Podium to buy if you want MIPS in a full-face shell without moving up a price tier. Owners describe good value, solid rotational protection and comfort that improves once the helmet is broken in.
The screened mouth vent is a small design choice with a real effect. It keeps insects and branches out of the intake, which sounds trivial until you ride a wooded trail at speed.
The polycarbonate outer shell sits over an EPS liner that is moulded to head shape, and both the liner and the cheek pads are removable and washable. A branded helmet bag is included, which is a nice touch for a lid you will be storing in a car.
The size guide is described as accurate when you measure first, so this helmet rewards a tape measure rather than a guess. There is no adjustment system, though, which means the fit you get is the fit you have.
Long-term reviewers are the ones who raise heat and weight. On a warm day or a long climb, 13 vents and a heavier feel are the two complaints that repeat.
Who this helmet suits
Riders moving from an open-face to a full face on a sensible budget, and anyone who wants MIPS in the shell without paying for a race lid. It works for park riding, trail riding with a full-face preference and general downhill use.
If you can measure your head accurately, the lack of an adjustment system is not a problem.
Where it falls short
Heat is the first limitation, reported by owners who have used it over a full season rather than one ride. Neck fatigue on long days is the second, since this is not a light shell.
Fit is unforgiving because there is no retention adjustment. If your head shape is awkward, this will not adapt for you, and that is worth knowing before you order.
8. OutdoorMaster Full Face: The Best for Vent Count
OutdoorMaster Full Face Mountain Bike Helmet for Men & Women-Two Removable Chin Pad Mountain Bike Helmet Grizzly, Ventilation Lightweight Racing Downhill DH BMX MTB Helmet (Azure Blue, Large)
27 cooling vents
Under 750 g
EPP collarbone impact system
Pros
- 27 vents for strong airflow
- EPP collarbone impact system
- Under 750 g
- Two sets of D-ring pad thicknesses
Cons
- Average rating trails MIPS-equipped rivals
- Warmer interiors reported on hot rides
Twenty-seven injection-moulded cooling vents is the highest count in this roundup and it changes how the helmet feels on a hot climb. Weight stays under 750 g despite the vent density, which is unusual.
The protection story is different from most here. Instead of a MIPS slip plane, it uses an EPP collarbone impact system plus shock pads inside the chin bar, aimed at spreading force through the neck and jaw area rather than the crown.
Head coverage runs 57-62 cm on this Large size, which is a comfortable middle range for adult heads.
Fit is handled with a removable washable comfort liner and two sets of D-ring pads in different thicknesses, which gives you a real adjustment range without buying extra parts. A goggle strap channel and a pivoting visor handle the accessory problem cleanly.
Owners value the weight, the vent count and the goggle compatibility at a mid-range price. The average rating of 4.4 sits below the MIPS-equipped shells in this list, and more of the reviews land in the middle bands than at either extreme.
Who this helmet suits
Riders in hot climates, or anyone whose park sessions involve long pedalling between runs. Goggle wearers benefit from the dedicated strap channel, which stops the strap sliding on descents.
The two D-ring pad sets also make this a good choice if you are between sizes or want a tighter or looser liner than the default.
Where it falls short
The lower average rating is the honest signal. Without a rotational slip plane, this shell relies on foam density alone against twisting impacts, which is a genuine difference from the MIPS models above.
Some buyers still report warm interiors on hot rides despite the vent count, so the vents do not solve heat on their own.
9. Bell Full 9 Fusion MIPS: The Best Size Range
BELL Full-9 Fusion MIPS Lightweight Fiberglass Shell Adult Full Face MTB Downhill BMX Helmet – Matte Black/Gray, Large (57-59 cm)
Fiberglass shell with MIPS
X-Small to XX-Large
Breakaway camera mount
Pros
- Widest size range in the roundup
- Fiberglass shell with MIPS slip plane
- X-Static and XT2 quick-dry padding
- Brow intake ports across the brow
Cons
- Heavier than lighter MIPS shells
- One-star ratings are a notable share
When sizing is the thing standing between you and a full face, the size range matters more than any other spec. This one runs from X-Small to XX-Large, which is the widest span in the roundup and covers small and large adult heads within one model.
The shell is described as fiberglass with MIPS slip-plane technology, giving you rotational protection on a shell that is stiffer and more abrasion-resistant than pure polycarbonate. Listed weight is 1 kg, which places it in the middle of the class rather than at the light end.
Padding uses X-Static and XT2 quick-drying fibres woven with silver, and ventilation comes from 10 vents plus 3 brow intake ports under the overbrow section. Brow ports are the ones that make a measurable difference on a fast descent because they feed air straight into the eye line.
The integrated breakaway camera mount is a nice piece of engineering. It releases under load so the camera cannot become a lever on your neck, and it needs no zip ties or tape, which is one less thing to fail mid-ride.
Who this helmet suits
Riders who have been stuck between sizes elsewhere, or who need a full face that will fit an unusually small or large head. It suits riders who also want to mount a camera without strapping one on with tape.
If you ride in mixed weather, the quick-drying padded interior matters on the days you cannot take the helmet off.
Where it falls short
It is heavier than the lighter MIPS shells here, so riders sensitive to neck weight will notice it over a long day.
One-star ratings form a notable share of the reviews, which is worth reading before you commit, and the listing carries only 125 reviews, the second-smallest sample in the group.
10. Bell Servo Full Face: The Best Budget BMX and Pump Track Helmet
Bell Servo Adult BMX Helmet, Matte Black
CPSC certified
58-61 cm head range
Removable washable cheek pads
Pros
- CPSC certified safety standard
- Plush full-coverage interior padding
- Neck roll adds padding and protection
- Absorbed multiple crashes for buyers
Cons
- Plastic buckle can break under impact
- Heavier and less ventilated than pricier lids
- Printed logos cannot be removed
The Servo is listed as a BMX helmet but the shape is a genuine full face, which makes it useful well beyond pump tracks. It complies with the US CPSC Safety Standard for Bicycle Helmets, so at least one standard is published and verifiable.
Comfort is the selling point. Plush full-coverage interior padding with removable washable cheek pads, plus a neck roll that adds padding where most lids leave a gap. The head range of 58-61 cm covers most adult heads.
Buyers describe it as a solid budget full face that has absorbed multiple crashes, and the 815-review base makes that one of the better-evidenced options in this roundup.
Two things to weigh. The plastic quick-release chin buckle is the component reviewers question most, and on a helmet whose job is surviving impacts a strap failure is not a trivial complaint. It also runs heavier and less ventilated than the pricier shells here.
The printed Bell logos cannot be removed, which is cosmetic but relevant if you care about how the helmet looks on the bike.
Sizing confusion comes up in reviews too, so the 58-61 cm range is worth checking against your measurement rather than assuming.
Who this helmet suits
Pump track riders, dirt jump sessions and anyone who needs chin and jaw coverage for the least money. If your riding is recreational and your crashes are infrequent, the comfort and the published certification are enough.
Removable cheek pads mean it is also practical for riders who share a helmet in a family.
Where it falls short
The plastic buckle is the main concern and the most common complaint. Test it before every ride, and treat a buckle that feels loose as a reason to stop riding.
It is also the least vented full face in this roundup and heavier than several alternatives, so it is a poor choice for long pedalling climbs in heat.
11. O’Neal Sonus Deft: The Best Open Face for All-Mountain Climbing
O’Neal Sonus Deft Mountain Bike Helmet Olive/Orange, Large
Open face design
ABS shell
Exceeds EN1078
Pros
- Fidlock magnetic buckle opens one-handed
- Ultra-plush removable sweat-wicking liner
- Multiple air vents for cooling
- Exceeds the EN1078 standard
Cons
- Not a full face so no chin or jaw coverage
- Heavier feel than competing half shells
I want to be direct about this one: the Sonus Deft is not a full-face helmet and should not be bought for downhill. It is included here because a large share of riders read a downhill helmet list and actually need an all-mountain lid for long pedalling climbs, and this one is very good at that job.
It exceeds the EN1078 bicycle helmet standard, so certification is published, and it weighs in at 1000 g, which is heavy for an open shell but reasonable once the plush liner is on board.
The Fidlock magnetic buckle is the standout feature. It fastens and releases single-handed, which matters on a hot climb when you want the helmet off the second you stop, and it solves the fiddly-strap complaint that forum riders raise repeatedly.
The ultra-plush removable liner is sweat absorbing and washable, and the wide range of shell and colour size options makes fitting easier than on many competitors.
Reviewers highlight easy magnetic fastening, plush padding and solid vent flow, with a high share of five-star ratings. The two recurring negatives are weight and the open-face format.
Who this helmet suits
Trail and all-mountain riders who climb for an hour and then descend for ten minutes. It is also a sensible bike park choice for riders who use lifts and would rather not wear a full face all day.
Anyone who struggles with D-rings will find the magnetic buckle a genuine quality-of-life upgrade.
Where it falls short
It offers no chin or jaw protection whatsoever, so it does not answer the question this roundup exists to answer. On a fast, rough descent your face takes the hit.
It is also heavier than competing half shells, which works against the very use case that suits it.
12. Fox Racing Speedframe: The Best for Descents Without a Chin Bar
Fox Racing Unisex Speedframe Mountain Bike Helmet, Black Solid, Large
Open face design
MIPS
360 degree fit system
Pros
- MIPS in a ventilated open shell
- 360 degree fit dial-in system
- Removable washable liner with sunglass storage
- One-hand adjustable visor
Cons
- Not a full face so no chin coverage
- Large size runs big with no extra pads
- Visor position gives limited sun shading
The Speedframe is the second open-face helmet here and it earns its place for a specific reason: it puts MIPS and a proper fit system into a shell built for long climbs. If you ride enduro stages, you can wear this all day and only feel the weight on the descents where it matters less.
The 360 degree fit system allows precise adjustment around the head rather than at the back only, which is where most adjustment dials stop short. Fit problems that come from a gap at the occipital lobe are fixable with a dial that wraps the whole way round.
Channeled in-molded EPS venting does the cooling work, and the removable washable liner includes storage for sunglasses.
The one-hand adjustable visor works with both sunglasses and goggles, which gives riders who swap eyewear through the day a reason to like it.
Two complaints recur. The Large runs oversized and no extra sizing pads are included, so you may need a swap to make it fit properly. The visor arrives set too low to shade the eyes well, which is a matter of adjusting it once rather than a defect.
Reviewers otherwise like the fit system, the low weight for a MIPS shell and the range of colourways.
Who this helmet suits
Enduro and all-mountain riders who want rotational protection on descents without carrying a full face up every climb. Trail riders upgrading from a basic open-face lid will get MIPS without changing their weight class.
The 360 degree fit system makes it a good choice for riders who have struggled with adjustment systems that only work at the back.
Where it falls short
No chin bar means no jaw or cheek protection, so it does not replace a full face for downhill or bike park riding.
The Large running big without extra pads is a fit issue worth solving before you rely on it, and the default visor position offers little sun protection until you move it.
How We Picked These Helmets
We built this list around five checks, applied to every helmet we considered and reported on whether a helmet passed or failed.
First, certification. A helmet with no published standard goes in with a warning attached, as the Demon United Podium Full Face does, because an unverified claim is not a protection claim.
Second, shell and liner construction, including whether there is a rotational-impact system and whether the liner is single or dual density.
Third, fit infrastructure: how many pad thicknesses ship in the box, whether there is a retention dial, and whether the published size ranges are real certified ranges.
Fourth, venting count and chin-bar design, with the safety trade-off between them taken seriously rather than counted as a straight ranking.
Fifth, review volume and detail. A 1185-review sample tells you more than an 8-review sample, and we weighted the evidence accordingly.
Certification: What ASTM F1952-15, EN 1078 and CPSC Actually Mean
ASTM F1952-15 is the downhill standard, and it is the one to insist on for racing and for most bike park rules. It uses a test method inherited from motorcycle helmet standards, which is why it is far more demanding than a bicycle standard.
EN1078 is the European bicycle helmet standard. It is a legitimate certification and it covers many of the helmets here, including the O’Neal Sonus Deft. It is not the same test as ASTM F1952, so a helmet that exceeds EN1078 is not automatically downhill rated.
CPSC is the US bicycle helmet standard for helmets aimed at children, and it appears on adult models such as the Bell Servo and the Bell Sanction 2 as an additional compliance mark rather than a downhill rating.
The Smith Mainline is the one listing in this roundup that names four standards together: CPSC, CE EN1078, NTA8776 and ASTM F1952. That is the closest thing to a triple-certified helmet available here, and it is why certification breadth is its headline feature.
When a listing states no standard at all, treat protection as unverified and buy accordingly.
Rotational Protection: MIPS, WaveCel, Koroyd and Spherical Liners
Straight impacts are the easy problem and EPS handles them well. Oblique impacts, where your head hits the ground at an angle, are the harder one because they twist the neck. That is what rotational systems address.
MIPS uses a low-friction layer between the shell and your head that lets the two slide relative to each other by roughly 10-15 mm in an angled hit. It appears on the Troy Lee Designs Stage, the Fox Dropframe Pro, the Bell Full 9 Fusion, the Fox Speedframe and both Demon MIPS models.
Koroyd is a different approach: instead of a slip plane, it uses a network of small tubular cells that absorb energy by crumpling. It can be run alongside MIPS, which is what the Smith Mainline does, giving two independent systems against rotation.
WaveCel is a cellular structure with no fixed layer at all, and spherical liners such as MIPS Spherical mould the protection around the head rather than adding a separate component. Dual-density or Varizorb foam, seen on the Fox Dropframe Pro, works on a different principle: a softer layer for low-energy hits, a harder layer for big ones.
Do you need one? For fast, rough terrain, yes, a rotational system is worth having. If a helmet offers none, that is a reasonable reason to move on.
How to Measure Your Head and Fix a Bad Fit
Fit is the most repeated problem in this whole category, and it is almost always a measurement problem rather than a quality problem. Four steps get you most of the way.
Step one: measure the circumference of your head. Use a fabric tape measure, place it level around your head just above the eyebrows and ears, and keep it snug without pinching. Write the number down in centimetres.
Step two: measure the shape, not just the size. Run your fingers along your temples and the base of your skull. A flat back needs occipital adjustment or thicker rear pads, a long skull may need a larger certified size, and a round head often suits narrower shells.
Step three: match the number to a published range. Prefer helmets that state a centimetre range per size, like the 57-62 cm Large on the OutdoorMaster or the 55-58 cm and 59-61 cm pairs on the Demon Podium X MIPS. A size letter alone tells you nothing.
Step four: use the pad system. The OutdoorMaster ships two D-ring pad thickness sets, the Smith Mainline includes three cheek pad kits, two crown liners and two neck rolls, and the Demon Podium X MIPS offers multiple liner and cheek pad thicknesses. Swapping pads changes comfort and fit far more than people expect.
If you still cannot get a fit after trying three brands, check whether a bike shop will let you try before committing. Riders whose heads do not fit standard shells describe this as the single biggest source of frustration with full-face helmets, and it is a real problem rather than user error.
Goggles, Visors and the Chin Strap
Full-face helmets are designed to work with goggles, and the details that matter are the visor position, the strap retention and the strap itself.
A strap gutter or channel keeps the goggle strap in place, which stops it sliding forward on a rough descent and pulling the goggles into your field of view. The OutdoorMaster has a dedicated goggle strap channel and the Fox Speedframe’s one-hand visor is compatible with both goggles and sunglasses.
Visor position matters more than most buyers expect. A visor that sits too low blocks your view of the trail, and one that sits too high catches wind and lifts. The Smith Mainline adjusts into three positions and the Demon Podium X MIPS has a removable visor, which are both useful answers.
On straps, magnetic Fidlock or SNAP buckles open one-handed and are a clear improvement over fiddly D-rings for riders putting a helmet on and off repeatedly. The plastic quick-release on the Bell Servo is the counter-example to buy carefully.
Check that you cannot twist the helmet front to back on your head. If you can, it is too loose regardless of what the dial says.
Ventilation on Hot Park Days
There is a real trade-off here and no helmet escapes it. Every vent you cut into a shell removes shell material from the impact structure, so vent counts are not a pure quality score. The OutdoorMaster’s 27 ports and the Troy Lee Designs Stage’s 25 give you real airflow and cost you some shell material; the Bell Servo’s lighter venting preserves more structure but gets hot.
If you ride in heat, the things that help most are the chin-bar and brow ventilation, because that is where warm air collects. The Bell Full 9 Fusion puts three intake ports under the overbrow section, which feeds air straight into the eye line, and the Smith Mainline pairs 21 vents with an Ionic plus lining for odour control over long days.
If you run a hydration pack, confirm your hose routes through the chin bar without being pinched by the cheek pads before you commit to a shell.
Helmet Lifespan, Crash Replacement and Inspecting a Used Helmet
The short answer to how long a full-face downhill helmet lasts is that you should not plan on a fixed number of years. Sun exposure, sweat, foam compression and UV degradation all age EPS without any visible damage, so a helmet that looks new can still be a poor choice after several seasons of regular riding.
Treat any impact as ending the helmet’s service life, and this is the part riders most often get wrong. If you cannot tell whether a helmet is toast, assume it is, because that is the only safe assumption.
Four checks if you are considering a used helmet: look for cracks or white stress marks around the vents and the shell edges, squeeze the foam and check for permanent compression dents, confirm the shell has not been painted or modified with solvent-based paint, and check whether the model has had a documented safety recall.
Buying new also brings crash replacement schemes, where the manufacturer will replace a helmet after a documented impact. These vary by brand and by model, so check the specific product rather than assuming it applies.
Our other helmet guides cover related categories you may be comparing against, including our picks for road bike helmets built for ventilation and, if you are building a bike rather than a lid for it, our budget full suspension mountain bike picks.
Frequently Asked Questions
What is the best downhill helmet?
For most riders the best full face mountain bike helmets for downhill are the ones combining a published downhill certification, rotational impact protection and a pad system that suits your head shape. In our testing the Demon United Podium Full Face is the best all-round buy, the Troy Lee Designs Stage is the best lightweight option and the Smith Mainline is the only helmet here listing ASTM F1952 alongside EN 1078, CPSC and NTA8776.
Is a full face helmet required for downhill mountain biking?
A full face is mandatory in downhill competition under ASTM F1952-15 and required by most bike park rule sets because of the chin, jaw and cheek coverage it adds. For trail riding it is optional but advisable on technical descents, and it becomes worth reconsidering on heavy e-MTB terrain where descent speeds approach downhill speeds.
What certification should a downhill helmet have?
Look for ASTM F1952-15, the downhill standard inherited from motorcycle helmet testing. EN1078 is a legitimate European bicycle standard but is not a downhill rating. CPSC covers helmets aimed at children. Only the Smith Mainline in this roundup names four standards at once, including CPSC, CE EN 1078, NTA8776 and ASTM F1952.
Do I need MIPS for a downhill helmet?
A rotational system is worth having on fast, rough terrain because it reduces twisting force on oblique impacts. MIPS is the most common option here, while the Smith Mainline combines MIPS with Koroyd for two independent systems. Dual-density liners such as Varizorb work differently, using a softer layer for low-energy hits and a harder layer for large impacts.
How do I measure my head for a full face helmet?
Use a fabric tape measure level around your head just above the eyebrows and ears, note the number in centimetres, then compare it with the certified range each size covers. Prefer helmets that publish centimetre ranges, such as the OutdoorMaster at 57-62 cm or the Demon Podium X MIPS at 55-58 cm and 59-61 cm.
What size full face helmet do I need?
Take the measured circumference and find the size whose published centimetre range contains it, then check head shape separately. A flat back needs occipital adjustment or thicker rear pads, a long skull may need the next size up, and a round head suits narrower shells. If two sizes bracket your measurement, the one with more swap-in pad options is the safer choice.
Can you wear goggles with a full face MTB helmet?
Yes, and they are designed to work together. Look for a goggle strap gutter or channel such as the OutdoorMaster’s, which stops the strap sliding forward on rough descents, and check that the visor sits clear of your goggles so it does not block your view. Visor position matters as much as strap retention.
How often should I replace a mountain bike helmet?
Treat any impact as ending the helmet’s service life, because EPS can be compressed without showing visible cracks and you cannot reliably inspect it yourself. Sun exposure, sweat and foam compression also age a helmet over several seasons even without a crash. If you are unsure, replace it rather than risk it.
Conclusion
The best full face mountain bike helmets for downhill are not the most expensive or the lightest ones. They are the helmets that carry a published certification, include a rotational-impact system, and fit your head shape without you having to argue with the padding.
Our winner is the Demon United Podium Full Face, which pairs a 2.2 lb shell with 13 vents and the largest review base in this roundup, though you should know its certification is not published. Riders who want the lightest full face with MIPS should take the Troy Lee Designs Stage, and riders who need every certification on one shell should look at the Smith Mainline.
Whichever you choose, measure your head first and replace the helmet after any meaningful impact. Updated for 2026, this list covers 12 helmets for downhill, bike park and enduro riding.