Details Whether the trail has big berms, rock gardens or flowy rollers, get after it with confidence in the Smith Engage MTB Helmet. 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 the brand's 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. Construction 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 Lightweight, low-bulk single layer webbing Fit Adjustable dial fit system for a customized fit Performance comfort lining Two position adjustable visor Ventilation AirEvac ventilation system integrates with Smith eyewear for fog-free lenses 21 fixed vents for consistent airflow Details Designed for ultimate integration with Smith performance eyewear for maximum comfort, venting and storage convenience CPSC and CE EN 1078 certified Helmet Size XS 48-52cm / 19-20.5" S 51-55cm / 20-21.5" M 55-59cm / 21.5-23.25" L 59-62cm / 23.25-24.5" XL 61-65cm / 24-25.5" Weight 12 oz / 350 g Size M Smith Engage MIPS Bicycle Helmet