Smith Optics Unisex Adult Holt Snow Sports Helmet plastic Buckle closure 10" high 11" wide Innovative, all-weather helmet can be customized with included convertible pad kit to keep you warm on winter slopes, and cool in summer skate parks Dual Regulator ventilation system independently controls front and rear sections of venting, exhausting heat through rear vents while maintaining sealed front end AirEvac system generates maximum airflow and removes warm, fog-causing air via air channels built into helmet, keeping your head dry and goggles clear ASTM F 2040, CE EN 1077:2007 Class B, and CPSC certified; 19-ounce weight; Skullcandy audio system compatible (sold separately) Includes limited lifetime manufacturer's warranty