Bell 4Forty Air MIPS Helmet
Best breathable protection for dedicated mountain bike trail riders.
A trail-focused lid that balances pro-level safety tech with everyday convenience. It prioritizes rider comfort through advanced moisture management and a secure, magnetic closure system.
$164.95
More 4Forty options
Who it's for
- Safety-conscious trail riders seeking advanced impact protection
- Riders who value convenience and quick transitions during their sessions
- Mountain bikers frequently riding in hot or humid climates
Who should skip it
- Enduro racers who prefer to stow goggles under the visor
- Long-distance cyclists who prioritize plush interior cushioning
- Heavy sweaters who rely on clear vision during technical descents
Performance breakdown
Impact Protection
Mips Evolve integration provides top-tier rotational force management for technical trails.
Ease of Use
Fidlock magnetic buckle makes securing your helmet effortless with one hand.
Moisture Management
Sweat Guide padding effectively channels perspiration away from your eyes.
Fit Customization
Float Fit system offers precise, lightweight adjustments for a secure hold.
Trail Versatility
Adjustable visor and eyewear storage adapt perfectly to changing riding conditions.
Hygiene Control
Ionic+ antimicrobial padding keeps the interior fresh during long, sweaty rides.
Key Specs
Weight
360g
Safety Certification
US CPSC
Fit System
Float Fit
Buckle Type
Fidlock magnetic
Safety Technology
Mips Evolve
Visor Type
3-position adjustable
Intended Use
Trail riding
Helmet Style
Half Shell
Know before you buy
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Ask Metto anything about the Bell 4Forty Air MIPS Helmet before you decide.