Retrospec Traverse H2 2-in-1 Convertible Helmet with 10 Vents 14 vents for ultimate temperature regulation with unyielding ABS shell exterior and firm, shock-absorbent EPS interior Certified ABS exterior and EPS Foam interior to provide you, the rider, with top of the line quality and protection. Helmet safety certifications include EN 1077:2007 for Ski Helmets and CPSC 16 CFR, Part 1203 for Bicycle Helmets. Includes goggle clip to keep eyewear attached & removable plush earmuffs for warmth and protection ErgoKnob Adjustable Dial is a simple one-handed twist dial that tightens and loosens the framework built into the helmet for a customized fit.