The Radix helmet supplies top-notch functionality and durability features at an entry-level price point. MIPS technology diffuses rotational force in the event of a crash, giving you confidence in your equipment and as a result, your riding.Stylish helmet meets the demands of modern aggressive trail ridingLightweight feel and maximum ventilation provide all-day comfort Roc Loc 5.5 technology allows for an impressive range of adjustabilityEPS foam liner is directly fused to polycarbonate shell for durabilityAdjustable visor adjusts for branch and sun protectionAges 5 and olderShell MaterialpolycarbonateClaimed Weight[medium] 11.2oz (318g)Manufacturer Warrantylimited 2 yearsVentilation25 ventsFit AdjustmentRoc Loc 5.5CertificationsComplies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and OlderVisor15 degrees of adjustment