Description Big berms, rock gardens or flowy rollers; no matter the trail, get after it with confidence in the Smith Engage MIPS. A feature packed mountain bike helmet for the everyday rider with Zonal Koroyd®. Zonal Koroyd® complements MIPS® for energy-absorbing impact protection in the event of a crash. A dial adjustable fit and extended back coverage provide a locked-in feel. On hot days or exposed climbs, 20 fixed vents and our AirEvac™ ventilation system keep you cool and comfortable. Channels on the front make it easy to stow eyewear and a two-position visor rotates up for on-the-go goggle storage. Protection Lightweight in-mold construction Zonal Koroyd® coverage for lightweight, energy-absorbing and ventilated impact protection MIPS® Brain Protection System reduces rotational forces caused by angled impacts to the head CERTIFICATION: CPSC, CE EN 1078 Fit / Integration Adjustable dial fit system for a customized fit Designed for ultimate integration with Smith performance eyewear and goggles for maximum comfort, venting and storage convenience AirEvac™ ventilation system integrates with Smith eyewear for fog-free lenses Size Small: 51-55cm Size Medium: 55-59cm Size Large: 59-62cm Size Extra Large: 61-65cm Features 20 fixed vents for consistent airflow Two-position adjustable visor Performance comfort lining Lightweight, low-bulk single-layer webbing Weight (Size Medium): 350 g