BREATHABLE DESIGN: Comstock’s netted mesh cap and 10 vents provide the ultimate temperature regulation while keeping you calm, cool and collected no matter the temp. OPTIMAL PROTECTION: Stay protected on the slopes and wear our durable ABS exterior shell and EPS foam interior helmet. Retrospec helmets are here to provide you, the rider, with top-of-the-line quality and protection. ADJUSTABLE FIT: Ergo knob adjustable dial is a simple one-handed twist dial that tightens and loosens the framework built into the helmet for a customized fit. Tighten it up for warmer days or loosen it if you need to toss a beanie underneath on chillier descents. SIZING: To determine the correct helmet size, wrap a measuring tape around your head. The tape should rest just above your ears and remain level around the circumference of your head. Small: 52-55 cm, Medium: 55-58 cm, Large: 59-62 cm 1. INCLUDES: The Comstock skiing and snowboarding helmet includes a goggle clip to keep eyewear attached & plush earmuffs for warmth and protection.