The best trail MTB helmets are the ones that suit the riding you actually do, not just the ones with the longest spec sheets. For UK riders, that usually means a helmet that is comfortable on climbs, secure on rough descents, stable through trail-centre turns and protective enough for woodland singletrack, bridleways, natural trails and electric mountain bike use.
That eMTB point matters. You do not need an eMTB-specific helmet, but an electric mountain bike can change how much riding you do in one session. Assistance often means more climbing, more descending, longer rides and more mixed terrain. Longer sessions make heat, pressure points and retention problems more noticeable. Protection should be assessed from the helmet’s intended use, fit and relevant testing—not inferred from how many laps you ride.
This guide focuses on open-face trail MTB helmets and high-coverage trail helmets. It does not include dedicated full-face or convertible helmets, because those are different buying decisions. If you already know you want a chin bar, read our guide to the best full-face MTB helmets 2026. If you want a removable chin bar, our best convertible MTB helmets 2026 guide is the better place to start.
For most UK eMTB and trail riders, though, a good open-face trail helmet is the one you will wear most often. It needs to fit properly, breathe well, work with glasses or goggles and give enough coverage for the riding you do week after week.
Quick choice: this is an open-face trail-helmet guide, not a downhill full-face ranking. Start with a secure fit, then compare coverage, ventilation, eyewear compatibility and the actual size/colour on offer. A low clearance price is not useful if the helmet does not fit.
Best overall: Troy Lee Designs A3 Mips
Troy Lee Designs A3 Mips
The Troy Lee Designs A3 Mips is a premium open-face trail helmet for riders who want deeper coverage, strong ventilation and a more substantial feel than a simple trail lid.
At Leisure Lakes Bikes
Price retained from the published article; check size, colour and availability with the retailer.
Read our review →+ Pros
- Excellent ventilation for a deep-coverage trail helmet
- Secure, confidence-inspiring fit
- Fidlock buckle is easy to use with gloves
− Cons
- Not the lightest open-face MTB helmet
Compare prices
Price retained from the published article; check size, colour and availability with the retailer. · Verified totals first; unconfirmed offers follow.
Prices and availability may change. Price reference: 2026-09-19 08:47 UTC. Prices are checked when this guide is updated. Confirm the current price and availability with the retailer.
Key specifications
- Type
- Open-face trail, enduro and eMTB helmet
- Rotational protection
- B-Series Mips
- Fit system
- TLD V3 precision fit system
- Ventilation
- 16 vents with internal channeling
- Visor
- Three-way Magnajust adjustable visor
- Best for
- premium trail, rougher descents and eMTB riding
Our verdict
The A3 is our trail pick for riders who like a deep, secure fit without giving up the openness of a conventional trail helmet. In our riding, ventilation remained a strength despite that substantial feel. The compromises are weight and a brow-pad arrangement that will not suit every head. Try it on before buying: if you prefer a less noticeable helmet for longer climbs, the lighter-feeling options in this guide deserve a look too.
More detail
The A3 combines B-Series Mips with EPS and EPP construction, a Fidlock magnetic buckle and a three-position Magnajust visor. The raised visor provides space for goggles, while 16 vents and internal channels support airflow. Its coverage does not replace the facial coverage of a suitable full-face helmet.
The shortlist
Best overall: Troy Lee Designs A3 Mips.
Lowest price: Rockrider EXPL 540 MIPS — £44.99.
Best value: Smith Pilot Mips — £63.99.
Everyday simplicity: MET Shelter Mips — £64.99.
Comfort-focused alternative: Bluegrass Rogue Core Mips.
Feature-rich option: Fox Speedframe Pro Mips.
More coverage from Smith: Smith Payroll Mips.
Alternative retention design: Canyon Deflectr.
Larger-head option: Endura MT500 Mips.
Ventilation-focused option: Specialized Ambush 3.
A trail MTB helmet should sit level on your head, cover the forehead properly and feel secure without needing to be over-tightened. If it moves when you shake your head, pushes into one part of your skull or makes you want to take it off after ten minutes, it is the wrong helmet for you.
Fit comes before brand, price or features. A cheaper helmet that fits properly is a better buy than a premium helmet that does not suit your head shape.
Best trail MTB helmets 2026
Rockrider EXPL 540 MIPS
The Rockrider EXPL 540 MIPS is the helmet in this guide for riders who want a proper trail-style lid with modern safety technology at the lowest sensible price.
+ Pros
- Excellent price for a MIPS trail helmet
- Sensible option for new riders
- Proper MTB-style shape and visor
− Cons
- Less refined than premium helmets
Compare prices
Hurricane Blue, size M · Verified totals first; unconfirmed offers follow.
Prices and availability may change. Prices last checked: 2026-10-05 08:42 UTC. Prices are checked when this guide is updated. Confirm the current price and availability with the retailer.
Key specifications
- Format
- Open-face trail
- Protection system
- Mips
- Retention
- 3D adjustment dial
- Ventilation
- 17 vents
- Claimed weight
- 335g, size M
- Visibility
- Rear reflective strip
Why it makes the shortlist
The EXPL 540 earns its place as an accessible first trail helmet, leaving more of the kit budget for shoes, gloves and other essentials. Its listed features include Mips, a visor and an MTB-style shell at a lower price than the other options here. We have not reviewed it, so fit and comfort need checking in person. Compare the MET Shelter and Smith Pilot if you can spend a little more, rather than assuming price alone determines the best fit.
Smith Pilot Mips
The Smith Pilot Mips is one of the easiest trail MTB helmets to recommend because it gets the value equation right.
At Tredz
Matte Flint, Large (59–62cm)
Read our review →+ Pros
- Strong value from a premium helmet brand
- Mips included
- Comfortable for everyday trail and eMTB riding
− Cons
- Fixed visor limits adjustment
Compare prices
Matte Flint, Large (59–62cm) · Verified totals first; unconfirmed offers follow.
Prices and availability may change. Prices last checked: 2026-10-05 08:42 UTC. Prices are checked when this guide is updated. Confirm the current price and availability with the retailer.
Our verdict
Read the full Smith Pilot Mips review →Key specifications
- Type
- Open-face trail MTB helmet
- Rotational protection
- Mips
- Fit system
- Adjustable dial fit system
- Ventilation
- 13 fixed vents
- Weight
- 370g claimed, size medium
- Best for
- trail centres, bridleways, woodland loops and first eMTB helmets
Our verdict
The Pilot is our value pick for everyday MTB and eMTB riding: straightforward to wear, without the bulky feel of a more substantial trail helmet. Its fixed visor is the compromise that matters most. It cannot be lifted out of the way for goggles or repositioned for low sun, so regular goggle users should compare an adjustable-visor option. For local woods, bridleways and general trail loops, its simplicity is a good reason to keep it on the shortlist.
More detail
Smith claims 370g for a medium, and the Pilot includes Mips. It is an approachable option when a new bike also means buying the rest of your riding kit. Our best eMTBs under £3,000 guide takes the same approach to balancing useful equipment with the overall budget.
MET Shelter Mips
The MET Shelter Mips is a sensible trail helmet for riders who want a straightforward open-face design with modern protection and good comfort.
At Tredz
Matt Black, Medium (56–58cm)
Read our review →+ Pros
- Simple and comfortable trail design
- Mips included
- Good everyday eMTB option
− Cons
- Fixed visor limits adjustment
- Ventilation can feel warm on slow climbs
Compare prices
Matt Black, Medium (56–58cm) · Verified totals first; unconfirmed offers follow.
Prices and availability may change. Prices last checked: 2026-10-05 08:39 UTC. Prices are checked when this guide is updated. Confirm the current price and availability with the retailer.
Our verdict
Read the full MET Shelter Mips review →Key specifications
- Type
- Open-face trail MTB helmet
- Rotational protection
- Mips
- Fit system
- Safe-T Sport
- Ventilation
- 12 vents with internal channeling
- Coverage
- Extended rear head coverage
- Best for
- everyday trail riding and mixed eMTB use
Our verdict
The Shelter is a sensible choice for everyday trail riding when you want an uncomplicated helmet at an accessible price. It suits local woodland loops, bridleways and trail-centre exploring more naturally than a brief centred on maximum open-face coverage. The Smith Pilot is its closest alternative here; fit with your usual glasses should help decide between them. There is little reason to stretch to a premium option if this gives you the comfort and adjustment you need.
More detail
MET’s Safe-T Sport fit system is paired with extended rear coverage, an integrated visor, 12 vents and sunglasses ports. Those details cover the everyday essentials. Riders wanting a deeper, more substantial fit can compare the Troy Lee Designs A3 rather than treating every open-face trail helmet as interchangeable.
Bluegrass Rogue Core Mips
The Bluegrass Rogue Core Mips is a strong all-round trail helmet for riders who want comfort, Mips protection, goggle compatibility and a premium feel without going too deep into enduro territory.
At Tredz
Price retained from the published article; check size, colour and availability with the retailer.
Read our review →+ Pros
- Comfortable and easy to live with
- Mips-C2 and Fidlock buckle included
- Good ventilation and goggle compatibility
− Cons
- Less distinctive than some premium rivals
Compare prices
Price retained from the published article; check size, colour and availability with the retailer. · Verified totals first; unconfirmed offers follow.
Prices and availability may change. Price reference: 2026-09-19 08:47 UTC. Prices are checked when this guide is updated. Confirm the current price and availability with the retailer.
Key specifications
- Type
- Open-face trail MTB helmet
- Rotational protection
- Mips-C2
- Fit system
- Safe-T Heta fit system
- Ventilation
- 16 vents
- Fastening
- Fidlock buckle
- Best for
- riders wanting a comfortable all-round trail helmet
Our verdict
The Rogue Core is a strong middle-ground choice if you want useful premium details without the deeper, more substantial feel of the A3. Comfort, ventilation and compatibility with glasses or goggles make it easy to include on a shortlist for varied UK trail rides. The magnetic buckle is particularly convenient with gloves. Choose between this and the A3 on fit and how much coverage you want, rather than counting features that both already provide.
More detail
The Rogue Core Mips includes Mips-C2, extended rear coverage, an adjustable visor, 16 vents and a Fidlock buckle. When trying it on, bring your normal glasses or goggles: compatibility is most useful when it works with the eyewear you actually own.
Fox Speedframe Pro Mips
The Fox Speedframe Pro Mips is the feature-packed trail helmet in this guide.
At Tredz
Price retained from the published article; check size, colour and availability with the retailer.
+ Pros
- Strong premium feature package
- BOA fit and Fidlock buckle
- Good ventilation for trail and eMTB use
− Cons
- Not as deep as high-coverage enduro-style helmets
Compare prices
Price retained from the published article; check size, colour and availability with the retailer. · Verified totals first; unconfirmed offers follow.
Prices and availability may change. Price reference: 2026-09-19 08:47 UTC. Prices are checked when this guide is updated. Confirm the current price and availability with the retailer.
Key specifications
- Type
- Premium open-face trail MTB helmet
- Rotational protection
- Mips Air Node
- Fit system
- BOA fit system
- Fastening
- Fidlock magnetic buckle
- Visor
- Three-position adjustable visor
- Best for
- premium trail riding, eMTB loops and mixed UK off-road use
Why it makes the shortlist
The Speedframe Pro makes the shortlist for riders who want a broad set of practical features in one trail helmet. Its listed BOA adjustment, movable visor, eyewear storage and magnetic buckle are relevant to rides that mix climbing, descending and changes between glasses and goggles. We have not reviewed this model, so that recommendation is based on its specification. Compare the A3 or MT500 if a deeper fit is your priority, and try the Fox with your usual eyewear.
More detail
The specification lists Mips Air Node, dual-density EPS, a three-position visor and a removable, washable liner. Check that the retailer’s listing matches this version: the model name and offer alone are not enough to establish which fit system or features are included.
Smith Payroll Mips
The Smith Payroll Mips is the helmet to consider if you like Smith’s fit and eyewear integration but want more coverage than the Pilot.
At Leisure Lakes Bikes
Price retained from the published article; check size, colour and availability with the retailer.
+ Pros
- More coverage than the Smith Pilot
- Strong Smith eyewear integration
- Good choice for faster trail riding
− Cons
- More expensive than many riders need
Compare prices
Price retained from the published article; check size, colour and availability with the retailer. · Verified totals first; unconfirmed offers follow.
Prices and availability may change. Price reference: 2026-09-19 08:47 UTC. Prices are checked when this guide is updated. Confirm the current price and availability with the retailer.
Key specifications
- Type
- Premium open-face trail MTB helmet
- Rotational protection
- Mips
- Coverage
- Extended trail coverage
- Eyewear compatibility
- Smith glasses and goggle integration
- Visor
- Adjustable visor
- Best for
- riders wanting a more serious Smith trail helmet
Why it makes the shortlist
The Payroll is the Smith option to consider when the Pilot’s simpler design does not meet your needs. Its extended coverage and emphasis on glasses and goggle compatibility give it a distinct place in this guide. We have not reviewed it, so we would choose between the two by checking fit and features in person. For mellow local loops the Pilot may be enough; the Payroll merits a closer look when those additional features will be used regularly.
Canyon Deflectr
The Canyon Deflectr is the most unusual trail MTB helmet in this guide, but it earns its place because it offers something genuinely different.
At Canyon
Price retained from the published article; check size, colour and availability with the retailer.
Read our review →+ Pros
- Incredibly comfortable on the trail
- Strong safety-led design with RLS technology
- Well ventilated for trail and eMTB use
− Cons
- HighBar system takes some getting used to
Compare prices
Price retained from the published article; check size, colour and availability with the retailer. · Verified totals first; unconfirmed offers follow.
Prices and availability may change. Price reference: 2026-09-19 08:47 UTC. Prices are checked when this guide is updated. Confirm the current price and availability with the retailer.
Our verdict
Read the full Canyon Deflectr review →Key specifications
- Type
- Open-face trail MTB helmet
- Rotational protection
- Canyon RLS release layer system
- Fit system
- HighBar 1.5 with rear micro-adjustment dial
- Ventilation
- Large intake, top and exhaust vents
- Visor
- Adjustable visor
- Best for
- safety-focused riders wanting a different trail helmet
Our verdict
The Deflectr’s unusual retention system is the main reason to try it rather than judge it from a photograph. In use, it felt much more conventional than its appearance suggests and was easy to forget about while riding. That comfort is its strongest recommendation here. Some riders will still prefer familiar straps and styling, so compare the fit directly with a conventional trail helmet before deciding whether this different approach works for you.
More detail
Canyon combines RLS impact technology with the HighBar retention system. An adjustable visor, sunglasses storage and goggle compatibility add practical trail features. The unusual mechanism is worth becoming familiar with before your first ride; its appearance or reassuring feel alone is not a measure of protection.
Endura MT500 Mips
The Endura MT500 Mips is one of the most practical trail MTB helmets in this guide for UK riding.
At Leisure Lakes Bikes
Price retained from the published article; check size, colour and availability with the retailer.
Read our review →+ Pros
- Comfortable enough to forget you are wearing it
- Generous L-XL sizing up to 63cm
- Mips and Koroyd protection package
− Cons
- No Fidlock buckle despite the strong feature set
Compare prices
Price retained from the published article; check size, colour and availability with the retailer. · Verified totals first; unconfirmed offers follow.
Prices and availability may change. Price reference: 2026-09-19 08:47 UTC. Prices are checked when this guide is updated. Confirm the current price and availability with the retailer.
Our verdict
Read the full Endura MT500 Mips review →Key specifications
- Type
- Open-face trail MTB helmet
- Rotational protection
- Mips with Koroyd core
- Fit system
- One-handed micro-adjust fit system integrated into the Mips layer
- Ventilation
- Large vents including top air intake zone
- Visor
- Removable adjustable visor
- Best for
- practical trail, all-weather riding and eMTB use
Our verdict
The MT500 stands out for practical UK riding, with a comfortable, secure feel and a size range that is useful for larger heads. The L–XL goes up to 63cm, which makes it worth trying if other helmets come up small. It is not especially light and lacks the magnetic buckle found on several rivals. Even so, its comfort and useful details make it a strong option for longer MTB and eMTB rides in changeable conditions.
More detail
The MT500 combines Mips and a Koroyd core with an adjustable visor, eyewear storage and a clip-on accessory mount. Follow Endura’s instructions when using accessories. The size range is a useful starting point, but measuring within it does not guarantee the shell shape will suit your head.
Specialized Ambush 3
The Specialized Ambush 3 is the premium trail option for riders who want a modern, airy open-face helmet with a refined fit and practical details.
At Balfe’s Bikes
Price retained from the published article; check size, colour and availability with the retailer.
Read our review →+ Pros
- Excellent ventilation for long trail rides
- Premium BOA fit and Fidlock buckle
- Good eyewear storage and practical details
− Cons
- Less coverage-focused than deeper trail helmets
Compare prices
Price retained from the published article; check size, colour and availability with the retailer. · Verified totals first; unconfirmed offers follow.
Prices and availability may change. Price reference: 2026-09-19 08:47 UTC. Prices are checked when this guide is updated. Confirm the current price and availability with the retailer.
Our verdict
Read the full Specialized Ambush 3 review →Key specifications
- Type
- Premium open-face trail MTB helmet
- Rotational protection
- Mips Air Node Pro
- Fit system
- BOA FS1
- Fastening
- Fidlock magnetic buckle
- Visor
- Adjustable breakaway visor
- Best for
- long trail rides, eMTB loops and premium open-face comfort
Our verdict
The Ambush 3 is the option we would shortlist for riders who put airflow and a less substantial feel high on the list. It fits longer loops and regular climbing well, with useful adjustment and eyewear details. Riders who prefer a deeper, more wrapped fit should compare the A3 or MT500 before buying. That choice is about how the helmet fits your riding and head shape; a lighter feel should not be read as a safety rating.
More detail
Its feature list includes Mips Air Node Pro, BOA FS1 fit adjustment, a Fidlock buckle, integrated eyewear storage and an adjustable breakaway visor. Bring your normal eyewear when checking fit so that the arms, retention system and storage work together.
What to look for in a trail MTB helmet
The first thing to look for is fit. A helmet should feel secure without pressure points, and the retention system should fine-tune the fit rather than rescue a poor shape. Brand fit varies, so measure your head circumference but do not assume the size chart tells the whole story.
Coverage is the next big decision. Open-face trail helmets leave the face exposed. Deeper rear and side coverage can change the fit and feel, but does not replace a chin bar or establish that one model is safer than another. Choose a helmet intended for your riding and compare relevant testing, not appearance alone.
Ventilation matters because mountain bike riders still climb, even on an eMTB. A motor helps, but it does not remove effort, especially on long trail-centre climbs, slow technical ascents or summer rides. A helmet with poor airflow can quickly feel annoying, and the helmet you find annoying is the one you eventually stop wearing.
Eyewear compatibility is worth checking. If you ride in glasses, make sure the arms do not clash with the retention system. Sunglasses storage is useful on climbs and café stops. If you ride in goggles, look for an adjustable visor and secure strap support.
Rotational impact technology is also now common. Mips and similar systems are designed to help manage certain angled impacts, while some brands use their own safety technologies. No helmet removes the risk from mountain biking, but modern protection systems are worth considering, especially when they appear on affordable helmets.
Finally, think about how your helmet fits into the rest of your riding. If your eMTB riding is getting faster, longer and more committed, it may also be worth looking at protection and insurance. Our eMTB insurance UK guide explains what to think about once the value of the bike and kit starts climbing.
Which trail MTB helmet should you buy?
For most riders, the best trail MTB helmet will be the one that fits properly and matches the riding you actually do. A helmet that is too hot, too bulky or the wrong shape will not be a good buy, even if it has an impressive feature list.
If you want the cheapest sensible option, choose the Rockrider EXPL 540 MIPS. If you want a premium-brand trail helmet under £100, choose the Smith Pilot Mips. If you want a simple everyday trail helmet, choose the MET Shelter Mips.
If you want the strongest all-round comfort and features, the Bluegrass Rogue Core Mips is a strong comfort-focused choice. If you want the most practical UK trail and eMTB helmet, choose the Endura MT500 Mips. It has the right mix of comfort, coverage, Mips, Koroyd and useful all-weather details.
If you want a premium deep-coverage helmet, choose the Troy Lee Designs A3 Mips. It is secure, well ventilated and confidence-inspiring on rougher rides. If you want the most interesting safety-led design, choose the Canyon Deflectr. It looks unusual, but feels impressively normal once riding.
If you want premium ventilation and a refined fit, the Specialized Ambush 3 is a strong choice. If you like Smith but want more coverage than the Pilot, choose the Smith Payroll Mips. If you want a premium feature-heavy trail helmet with BOA, Mips and Fidlock, the Fox Speedframe Pro Mips is the obvious pick.
Riders who are now doing faster, steeper or more regular descending on an eMTB may want to step up to a high-coverage open-face helmet. Riders who are regularly riding bike parks, steep off-piste lines or high-consequence trails should consider whether a full-face helmet is the better choice.
Choose a helmet intended for the riding you do, then check secure fit and comfort. An open-face model leaves the face exposed; ventilation or a reassuring feel should not be mistaken for equivalent coverage to a suitable full-face helmet.
Read the individual tests before choosing
Our longer reviews explain the fit and riding context behind several recommendations: Endura MT500 Mips, Smith Pilot Mips, Bluegrass Rogue Core Mips and Specialized Ambush 3. Use those details to narrow the shortlist, then try the correct size with your usual glasses or goggles.
A practical fit check before your first ride
Follow the helmet maker’s instructions for position, straps and retention. Check for pressure points and movement with your head turning and your eyewear in place. A retention dial should fine-tune a suitable fit, not compensate for the wrong shell size. Do not add a bulky hat that changes the fit without checking the manufacturer’s guidance.
For repeated bike-park descents or riding where facial coverage is important, compare our full-face helmet guide or convertible helmet guide. The right category comes before the brand or discount.
Best trail MTB helmets FAQs
What is the best trail MTB helmet?
The best trail MTB helmet for most riders is a comfortable open-face helmet with good fit, ventilation and enough coverage for UK trail riding. The Smith Pilot Mips is a strong value choice, while the Endura MT500 Mips and Troy Lee Designs A3 Mips offer more coverage and trail confidence.
Do you need an eMTB-specific helmet?
No, you do not need an eMTB-specific helmet. Most riders should choose a proper trail MTB helmet that fits well and suits their riding. eMTB riders may benefit from more coverage, better ventilation and good goggle compatibility because assistance often means longer rides and more descending.
Should I wear a full-face helmet for trail MTB riding?
You should consider a full-face helmet if your riding includes steep descents, bike parks, enduro tracks, high speeds or repeated downhill laps. For everyday trail centres, bridleways and woodland loops, a good open-face trail helmet is usually more comfortable and practical.
Is Mips worth it on a trail MTB helmet?
Mips and similar rotational impact systems are worth considering because they are now common on many modern trail MTB helmets, including affordable options. Fit, coverage and correct helmet choice still matter most, but rotational impact protection is a useful feature.
What is the difference between a trail helmet and an enduro helmet?
A trail helmet is usually lighter, better ventilated and designed for general off-road riding. An enduro helmet normally has deeper coverage, a more protective feel and better goggle compatibility. Many eMTB riders sit between the two categories.
How should a trail MTB helmet fit?
A trail MTB helmet should sit level, cover the forehead and feel snug without pressure points. It should not rock when you move your head, and the straps should sit neatly around the ears with the buckle comfortable under the chin.
Is a cheap MTB helmet safe?
A cheap MTB helmet can still meet required safety standards, but it may not have the same comfort, ventilation, coverage or features as a more expensive helmet. Fit and certification matter more than brand status alone.
When should I replace a trail MTB helmet?
You should replace a trail MTB helmet after any significant crash or impact, even if the damage is not obvious. You should also replace it if the shell, straps, retention system or foam are damaged, or if it has become old, heavily used or poorly stored.