OVERBROW VENTILATION—Overbrow Ventilation features intake ports on the brow of the helmet to usher in cool air and push it through the air-channel matrix for full-head ventilation

Similarly, bike helmet manufacturers aren't required to use MIPS in their helmets. However, having that extra layer of protection against potential injuries, especially rotational ones, can be a compelling enough reason to consider investing in a MIPS helmet. Equipped with pro-level technology but designed with the privateer in mind, the Bell 4Forty Air MIPS is the first choice for your next trail helmet. Despite being slightly heavier than other options, the AVENUE MIPS doesn't compromise on comfort. Riders have praised its comfortable fit and user-friendly features, including an adjustable dial fit knob that allows for easy adjustments on-the-fly. This means that you can easily customize the helmet to fit your head securely and comfortably. It makes sense when you think about any time you’ve crashed a bike, or even just fallen over. The likelihood of you dropping vertically onto the ground being exposed only to a linear force is incredibly slim – there is almost always an angle involved.

Fit system: Float fit - a minimalist, lightweight fit system with an easy-to-turn rubber overmolded dial for adjustments (integrated with MIPS)

Overbrow ventilation features intake ports on the brow of the helmet to usher in cool air and push it through the air-channel matrix for full-head ventilation Safety: wraparound chin bar: a removable protective chin bar, designed for trail riding adapability -- no tools required. Warning: all chin bars have limits, and serious injury or death can occur. Read owner's manual carefully before using your helmet.Rotational motion is a common cause of concussions in oblique hits to the head. In a crash, the Mips system is designed to move slightly inside the helmet to help redirect forces away from the head.

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What to look for when buying a road bike helmet

WaveCel,” says Sam Foos at Bontrager, “is a collapsible cellular material that is designed to be more effective than traditional foam helmets in protecting your head from injuries caused by certain cycling accidents. It works by going through a three-step change in material structure to help absorb the rotational force of impact before it reaches your head.” Interior/liner type: Sweat guide pad design pulls moisture away from the brow pad and away from eyewear