The A3 mountain bike helmet is a new standard in premium mountain bike helmets with luxurious comfort

The performance-oriented cut is constructed of a 4-way stretch woven fabric and feature a comfort waist adjustment system

same great performance and durability as before

You'll see this Troy Lee D4 helmet worn by Brandon Semenuk

When the temperatures drop

Skyline Air Short Shell Mono Quarry Size:30 The A3 mountain bike helmetNew and improved for 2023, the ventilated Skyline Air Short is made entirely of our newly developed 4 way stretch Aero Tech micro ripstop. This fabric couples an extremely durable light weight ripstop with ventilation throughout entire short. Along with its sibling, the Skyline Short, we have modernized and refined all the details while preserving the design language of the original.