Big berms, rock gardens or flowy rollers. No matter the trail, get after it with confidence in the Smith Engage Mountain bike 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 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.