FEATURES: Recommended use for trail riders Full-wrap in-mold polycarbonate shell with EPS liner Wind tunnel vents with internal channeling keeps things cool even when the riding gets rowdy P.O.V. 15 degrees adjustable visor Quick dry padding Slimline webbing Super fit engineered with three-panel palm Complies with the US CPSC Safety Standard for Bicycle Helmet for Persons Age 5 and Older TECHNOLOGY: Equipped with MIPS(R), the Multi-Directional Impact Protection System, so you not only stay cool but stay safe with extra protection and durability Integrated MIPS(R) reduces rotational forces while enhancing comfort and fit Polycarbonate Hardbody(TM) lower shell extends coverage to the inside of the helmet to eliminate adhesives and excess weight Roc Loc(R) 5.5 Fit system features a simple and effective rear thumb dial for a comfortable and secure fit SPECS: Circumference: S: 20 in. - 21.75 in. / 51 cm - 55 cm M: 21.75 in. - 23.25 in. / 55 cm - 59 cm