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Best half-shell mountain bike helmets: open face helmets for trail and enduro riding

Poc Tectal Race SPIN
(Image credit: POC)

Mountain biking is a great outdoor pursuit, but as is the case with any wheeled activity, there’s an associated risk. The best half-shell mountain bike helmets are designed to offer increased protection around the back and side of your head without impeding airflow like a full-face helmet.

Whichever you choose, a helmet is an accessory you cannot do without. Whether it’s skidding out on a slippery tree root or going straight over the handlebars, when things go awry, a half-shell mountain bike helmet can be crucial and will earn its value by protecting you from severe injury during a crash. 

The MTB helmet market is enormous, with a rich diversity of options: design, fit, comfort, safety features and fashion are all elements which might influence your choice, so a considered approach is required to purchase the best mountain bike helmet for your requirements.

It is also important to not recycle MTB helmets after a crash. Your helmet is designed to absorb and deflect the trauma of a single big crash. Even if it appears structurally undamaged, a visual inspection isn’t surety. A golden rule is to never use a helmet which you have crashed heavily with. Despite having an undamaged appearance, it has done its job, and you now need another.

Best half-shell mountain bike helmets

Best half-shell mountain bike helmets: Bell 4Forty MIPS is a the definitive trail-riding MTB helmet

(Image credit: Bell)

1. Bell 4Forty MIPS: Best overall

Verdict: The definitive all-round trail riding helmet

Price: £89/$110 | Weight: 380g | Colours: 10 | Rotational safety: MIPS

Superb value for those riders who want to feel safer with a bit more coverage 
Great balance between price and features
Works well with eyewear
Not much – it could possible be lighter

Bell helmets are renowned for their intuitive shaping, with many riders finding a Bell the most comfortable compromise. The brand’s 4Forty MIPS is a trail helmet which sits at a very appealing point of convergence between price and features. 

With 15 vents it is trail helmet which won’t make you uncomfortably warm when riding on a summer’s day. If you are a rider who struggles with helmet perspiration management, this Bell will be an excellent choice as it features a considered sweat pad design and great portage gutters, which guide excess moisture away from your eyes. 

Bell’s visor design also plays nice with both goggles and sunglasses, providing convenience helmet stowage for both, when not in use. 

Best half-shell mountain bike helmets: Poc Tectal Race Spin takes safety to a new, high-tech level

(Image credit: Poc Tectal)

2. POC Tectal Race Spin: Best for safety

Verdict: Adding digital features to a renowned safety specification

Price: £200/$220 | Weight: 368g | Colours: 3 | Rotational safety: SPIN

Incorporates digital guardianship to its medical endorsement 
SPIN technology
Not the best warm-weather riding helmet

Sweden has contributed handsomely to the current offering of mountain bike helmet technologies and POC has once again elevated its offering with the new Tectal Race Spin. 

With a snowsport safety background and headed by a team of surgeons, POC’s entire design approach is safety centric. This new helmet incorporates helmet tech that could save your life. This comes in the form of a digital chip which stores crucial medical information and can be accessed using NFC technology. That means that if you do crash, and can’t speak, a response team can render critical first aid using information extracted from your POC helmet’s digital data chip. 

To negate rotation impact injuries this latest Tectal Race helmet features POC’s SPIN (Shearing Pad INside) technology. Around the back there is a very clever goggle clip, which will appeal to enduro riders. 

Best half-shell mountain bike helmets: Smith Optics Forefront 2 MTB helmet offers fantastic ventilation

(Image credit: Smith Optics)

3. Smith Optics Forefront 2: Best for ventilation

Verdict: Monegasque technology in an American design

Price: £150/$230 | Weight: 380g | Colours: 8 | Rotational safety: MIPS

Aerocore construction
Safer and cooler (literally) to ride
Great ventilation
The most expensive helmet on test

Its unique design feature is the Aerocore construction, which has 30% better energy absorption than EPS foam. You’ll find a MIPS liner inside too, for rotation deflection mitigation. Smith Optics also use a structure sourced from Koroyd, a specialist safety technology company based in Monaco. This features a grid of collapsible polymer cylinders, which provides outstanding airflow management and energy absorption. 

Beyond the great safety features, Smith’s Trace features 20 ventilation ducts, which means it is a delightfully cool helmet to wear on a sweltering all-day weekend ride. 

Best half-shell mountain bike helmets: Endura Singletrack II is a great value half-shell MTB helmet

(Image credit: Enduro)

4. Endura Singletrack II: Best for value

Verdict: A bargain warm weather trail rider’s helmet

Price: £74.99 /$91.99 | Weight: 284g | Colours: 4 | Rotational safety: No

Low weight
Great coverage 
Good ventilation
 Very competitively priced 
No rotational energy absorption

Few rivals can offer the value of the Singletrack II. Moulded with generous coverages, this is a trail helmet which feels both snug and safe. 

It also has 14 ventilation ports, which mean that the Singletrack II is a great choice for warm weather rides. The material removed for shaping those ample ventilation ports mean the Singletrack II is light too. 

An adjustable visor makes stowing your goggles a synch. The only real issue is a lack of rotational impact protection, as the Singletrack II does not feature an energy absorbing liner, such as MIPS. 

Leatt DBX 1.0

(Image credit: Leatt)

5. Leatt DBX 1.0 MTN: Best for beginners

Verdict: Entry level enduro helmet coverage

Price: £54.99 | Weight: 342g | Colours: 4 | Rotational safety: No

Turbine 360 tech
Adjustable peak
Bargain price
Decent fast cooling
Big pads get sweaty
Hot at slow speeds

Despite being a budget helmet, the Leatt DBX 1.0 MTN comes with a healthy chunk of tech which makes it one of the best entry-level enduro capable helmets on the market.

The DBX 1.0 is packed with nine 360° Turbine Technology wheels which provide a dampened movement between the helmet and head during impacts. Leatt claim 30 per cent reduction in head impact loads at concussion levels and 40 per cent reduction in rotational G transfer.

There are 14 decent sized vents which lead to internal channelling to keep the head cool although it's not as effective at slower speeds when compared to pricier options. The one-piece padding is decently comfortable and there is an adjustable visor to help keep sun or rain out of the eyes.

How to choose

Any helmet is a compromise between weight, safety and comfort. The helmet’s primary function is protection, but for most for most of its lifecycle, it will be an accessory judged on comfort. 

With the helmet secured, riders want to have the confidence that if something does go wrong, their helmet will validate its protection rating. 

1. Comfort

Comfort is crucial. When you are riding in warm conditions having ample cooling airflow is important. To build a helmet structure which allows sufficient airflow, without compromising structural safety, is deeply challenging.

2. Structure

Engineering a crash safety-compliant structure, with enough ports that will cool your head, even at low riding speeds, is a special industrial design skill. Moisture management is another consideration: when you start perspiring, you want a helmet which will prevent moisture running into and stinging your eyes. 

3. Fit

Although the helmet’s fastening system does allow for adjustability, certain mountain bike helmet brands will be superior in their moulded fit for specific riders. The only way to know is by trying on a few different brands and feeling which is most comfortable for your cranial profile. 

4. Rotational protection

Although the helmet’s primary function is to absorb energy during a crash, preventing head trauma, its safety features are not merely structural. During the last few years helmets have been marketed with a variety of rotational acceleration mitigating technologies. Amongst these, the MIPS liner is most famous, but there are now an array of liners which prevent rotational acceleration of the head, if you crash at a peculiar angle. 

5. Visor

Depending on your dominant riding climate and geography, you might want a visor. Although a visor is less aerodynamic, it does have the benefit of shading you during a warm day in open terrain. It is also handy when descending a technical trail into a setting sun, with the visor capable of blocking some of the direct sunlight which could blind you at a critical moment, when rolling into a technical trail feature. 

Fixed visors aren’t sensible for those riders who wish to prioritise efficiency above all else. For mountain bikers who live in particularly windy areas and ride on open dual tracks at higher average cadence speeds, a visor can be annoying, with the wind snatching at it. Adjustable and removable visors are preferable. 

6. Safety

We’ve established which comfort features you should evaluate, depending your local riding area’s climate, but what about the helmet’s reason for being: safety? The helmets on our list have all passed fundamental validation, but there are newer technologies that can assist you in the unfortunate scenario of a crash. 

A brilliant new technology, which has incubated from Sweden, as many other helmet safety technologies, are data chips. Using NFC technology, helmets can now dispense medical information about a rider, after they have crashes, without requiring an active data signal. 

Peripheral issues which might influence your helmet choice are camera mounts and goggle clips, but these should not be atop your list of requirements.