When you spend more days on the mountain than off, the Smith Nexus is your helmet for bomber protection that holds up season after season. In addition to a hybrid shell that balances a lightweight, low-profile design with a durable hard shell exterior, the Nexus steps up impact coverage with KOROYD throughout the helmet, a fully-vented material that absorbs more energy in a crash than traditional foam construction alone. Add Mips for increased safety during angled impacts, and you have our most advanced helmet design. Since all this protection is useless if you don&&';;t want to wear it, we dialed up the comfort level with a micro-adjustable BOA 360 Fit System that adapts to your whole head. A sweat-wicking, odor-fighting liner keeps you warm, while a front and rear adjustable 24-vent design lets you regulate airflow as needed. Features: 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 Air Evac 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 Fid lock 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