If you spend more days on the mountain than off, the Smith Quantum is your helmet for bomber protection season after season. In addition to a hybrid shell that adds durability, the Quantum 's secret comes from using Koroyd (R) throughout the helmet, a fully-vented material that absorbs more energy in a crash than traditional foam construction alone. Add MIPS (R) 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 system that micro-adjusts around your whole head. A sweat-wicking, odor-fighting liner keeps you warm, while an easily adjustable 22-vent design lets you adjust airflow as needed. 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 Aerocore (TM) construction featuring Koroyd (R) for lightweight, energy-absorbing and ventilated impact protection MIPS (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 Fit / Integration BOA (R) 360 Fit System offers the most adjustable fit with the turn of a dial for on-the-fly micro-adjustability Fidlock (R) strap buckle offers easy one-hand operation AirEvac (TM) ventilation system integrates with Smith goggles for fog-free lenses Removable ear pads for form-fitting comfort Available in Asia fit Features Antimicrobial lining fights odors 22 vents Outdoor Tech (TM) audio system compatible Weight (Size M, MIPS (R)): 23 oz / 650 g Smith Quantum MIPS Helmet Mens | Matte Black | Size Small