The Giro(R) Adult Fixture(TM) Bike Helmet provides protection from impact while delivering a cool design for the trails. It features the Roc Loc(R) Sport Fit system for an easy and versatile fit, and an in-mold polycarbonate shell with an EPS liner that keeps the helmet lightweight but strong. With 18 vents, the Fixture(TM) offers cooling ventilation. FEATURES: Designed for mountain biking Roc Loc(R) Sport Fit system provides an adjustable, comfortable fit Ventilation: 18 vents In-mold polycarbonate shell with EPS foam liner for impact absorption Full Hardbody(TM) shell for maximum durability Features quick-dry padding Removable visor for coverage from the sun Reflective detailing for added safety Complies with U.S. CPSC Safety Standard for Bicycle Helmets for persons age 5 and older SIZING: Universal Fit Size: 21.25" - 24" / 54 - 61cm