Technology: Zonal Koroyd(R) coverage for lightweight, energy-absorbing and ventilated impact protection MiPS -Equipped with the Multi-Directional Impact Protection System, you not only stay cool but stay safe with extra protection and durability Design: Designed for ultimate integration with Smith performance eyewear and goggles for maximum comfort, venting and storage convenience AirEvac(TM) ventilation system integrates with Smith eyewear for fog-free lenses VaporFit(TM) dial adjustment system 270 degree fit adjustment with just a simple turn of a dial FEATURES: 21 fixed vents for consistent airflow Performance comfort lining Lightweight, low-bulk single layer webbing CPSC and CE EN 1078 certified Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older