Bell 4Forty Air MIPS Helmet
Best breathable protection for dedicated mountain bikers on technical trails.
Built for aggressive trail riding, this helmet balances lightweight construction with robust protection. It features advanced rotational impact management and a highly effective ventilation system that keeps air moving during intense climbs. The secure, adjustable fit ensures stability on fast, technical descents, making it a reliable choice for all-mountain enthusiasts.
$164.95
at
BikeShoes.com
More 4Forty options
Who it's for
- Safety-conscious riders seeking advanced protection without a bulky profile
- Mountain bikers who value convenience and quick transitions
- Trail riders frequently tackling steep climbs in warm climates
Who should skip it
- Enduro racers who prefer to stow goggles under their visor
- Long-distance cyclists who prioritize plush interior cushioning
- High-intensity athletes who sweat heavily during technical sections
Performance breakdown
Rotational Impact Protection
MIPS integration provides industry-standard defense against angled impact forces.
Ventilation Efficiency
Overbrow channels keep air moving effectively during high-exertion climbs.
Trail Coverage
Extended rear shell design offers crucial protection for aggressive riding.
Fit Customization
Float Fit system allows for precise, secure adjustments on the fly.
Eyewear Compatibility
Thoughtful visor design accommodates both goggles and sunglasses without interference.
Weight-to-Durability Ratio
Lightweight polycarbonate construction balances agility with necessary trail toughness.
Key Specs
Safety System
MIPS
Construction
In-Mold polycarbonate shell
Fit System
Float Fit
Ventilation
Overbrow Ventilation
Intended Use
Trail, all-mountain riding
Know before you buy
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