Protection Hybrid shell construction blends a durable exterior with a lightweight in-molded shell for durability where you need it most while keeping the helmet light Complete KOROYD® coverage for lightweight, energy-absorbing and ventilated impact protection Mips® Brain Protection System reduces rotational forces caused by angled impacts to the head Exoskeleton enhances impact protection in side impact zones Certification: ASTM F 2040, CE EN 1077:2007 CLASS B Fit / Integration AirEvac ventilation system integrates with Smith goggles for fog-free lenses Removable ear pads for form-fitting comfort BOA® 360 Fit System offers the most adjustable fit with the turn of a dial for on-the-fly micro-adjustability Fidlock® strap buckle offers easy one-hand operation Features Ionic+® antimicrobial lining offers sweat-activated odor control Dual regulator climate control offers easy, one-handed front and rear vent adjustment Aleck® audio system compatible Weight (Size M): 19oz / 550g