Look steezy and feel safe with the Bell 4Forty Air MIPS Bike Helmet. The Ionic+™ and Sweat Guide™ padding take your comfort to the next level with their sweat-wicking properties and the three-point visor allows for ample coverage and quick eyewear storage. MIPS construction reduces rotational forces on impact and the Float Fit™ system and Fidlock™ buckle let you dial your fit for everyday trail-riding perfection.
Material
Fusion In-Mold Polycarbonate Shell– A process pioneered by Bell bonds the helmet’s outer shell to the EPS foam liner to create a sturdier helmet.
Construction
In-Mold Construction– Fuses a tough polycarbonate outer shell with the helmet’s impact-absorbing foam liner. The fusion process allows for better ventilation systems making in-mold helmets lighter and cooler than traditional helmets.
Ionic+™ Padding– Quick-drying interior padding helps manage sweat while fighting odor-causing bacteria.
Sweat Guide™ Padding– Sweat Guide™ pad design pulls moisture away from the brow pad and away from eyewear.
Fit
Float Fit™– Minimalist, lightweight fit system with an easy-to-turn rubber overmolded dial for adjustments.
Fidlock® Buckle– Fidlock® is an eay-to-use magnetic buckle. This time-saving feature slides closed laterally for an effortless, secure fit.
Additional Features
Three-Position Adjustable Visor– Three-position adjustable visor allows for sun protection and integrates easily with goggles or glasses.
MIPS®-Equipped– MIPS stands for Multi-Directional Impact Protection System, which is a leading slip-plane technology inside the helmet designed to reduce rotational forces that can result from certain impacts.
Safety Standards
Complies with the US CPSC Safety Standard for Bicycle Helmet for Persons Age 5 and Older
- Material: Polycarbonate
- Biking Type: Mountain MountainMountain bikes are built for tackling rough terrain with frames made of durable materials like aluminum or carbon fiber, ensuring stability and maneuverability. They feature suspension to absorb impacts from rocks, roots, and drops, providing a smoother ride.
| Size | S | M | L | XL |
| Weight (g) | 360 |








































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