BELL 4Forty Air MIPS Adult Mountain Bike Helmet - Matte Light Gray/Nimbus (2024), Medium (55-59 cm)

Integrated MIPS: Integrated MIPS (Multi-Directional Impact Protection System) is designed to reduce rotational forces that can result from certain impacts. By integrating the MIPS slip-plane into the retention system, we are able to reduce complexity and weight for a compact, better-ventilated helmet that fits more closely.