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 hardshell exterior, the Nexus steps up impact coverage with KoroydA(R) throughou t the helmet, a fully-vented material that absorbs more energy in a crash than traditional foam construction alone. Add MIPSA(R) for increased safety during angled impacts, and you have Smith&';s most advanced helmet design. Since all this protection is useless if you don&';t want to wear it, Smith dialed up the comfort level with a microadjustable BOAA(R) 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. 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 KoroydA(R) coverage for lightweight, energy-absorbing and ventilated impact protection MIPSA(R) 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 AirEvac(TM) ventilation system integrates with Smith goggles for fog-free lenses Removable ear pads for form-fitting comfort BOAA(R) 360 Fit System offers the most adjustable fit with the turn of a dial for on-the-fly micro-adjustability FidlockA(R) strap buckle offers easy one-hand operation Ionic+(TM) antimicrobial lining offers sweat-activated odor control Dual regulator climate control offers easy, one-handed front and rear vent adjustment Aleck(TM) audio system compatible; not included