The progression toward achieving a low-profile design without compromising any protection finally meets supremacy in a hard shell ski helmet. The Thrive sk ihelmet is clean & simple with the inconspicuous Passive Channel Venting. But when put on, it is souped-up with the K2 Dialed Fit System & a washable Full-Wrap liner system for optimal fit & comfort. Features Passive-Channel Venting Channels on the inside surface of the EPS direct air-flow between your head & the helmet, removing moisture & excess heat; keeping you dry & comfortable all day long. Available on all K2 helmets. K2 dialed Fit System An ergonomically inspired three-point adjustable interface maximizes fit & customization. Sizing your helmet with the twist of a dial gives you the ultimate convenience of on-the-fly adjustability. Washable Full Wrap Liner System This full-coverage, washable liner snugly cradles your head, creating the unmatched fit of a K2 helmet. The liner features a crown mesh that wicks moisture & breathes to prevent overheating. The Full-Wrap Liner System is seamlessly integrated with both our standard & 360 K2dialed™ Fit Systems & K2 Baseline Audio, creating the ultimate user experience. There are no gaps, which means a better fit & enhanced comfort. Hard Shell Hard-Shell helmets are built to last & will look good no matter how many trips they make in & out of your gear bag. Hard-Shell helmets protect you from impact thanks to a lightweight EPS foam bonded to an injection-molded & durable ABS shell.