Iconic, airy design with top-rated protective capability for wide open riding Far, fun and full gas. If that's your formula for a great ride, the latest Z1 is for you. We've kept the breezy silhouette and supremely comfortable fit that makes this helmet so beloved, while further enhancing protective capability with an all-new KinetiCore liner. And when fitted with optional accessories like the Aeroshell for improved aero efficiency or the universal LED light for greater visibility, the Z1 truly comes into its own as "the One" you want for riding every day, any day. Features: - Made for Epic Days: From the toughest road races to the rowdiest gravel adventures, the Z1's ideal balance of light weight, ventilation and protective performance is second-to-none - 5-Star Protection: Awarded "Best Available" protection rating by Virginia Tech's independent helmet testing organization - Precise Fit Comfort: Advanced ScrollSys fit system cradles the skull while allowing intuitive, quick adjustments for a precise, stable fit - The Power of Cool: massive ventilation channels supercharge airflow through the helmet to enhance cooling (the Z1 is up to 3% cooler than not wearing a helmet at all!) - Lightweight Leader: among the lightest in its class at 220g (size M) yet fully-featured with leading protective capability - Full Size Range: S 52 - 56cm, M 55 - 59cm, L 58 - 61cm