Vigilis Convertible Ski Snowboard/Bike Helmet by Traverse Sports$32.74
14 vents for ultimate temperature regulation with unyielding ABS shell exterior and firm, shock-absorbent EPS interior. Adjustable dial to customize fit. Removable plush earmuffs for warmth and protection, with pocket for storing headphones. Goggle clip to keep eyewear attached. Replaceable foam pieces to transform into bike helmet.