K2 Thrive Helmet - Men's: Toss in a little flavor to your cranial accessories with the K2 Thrive Helmet. This stout freak adds a subtle visor brim if that's your kind of thing. And the best part? It's bike-certified, so you can run double duty from the ski hill to the city commute. K2DIALED(TM) FIT SYSTEM: The K2Dialed(TM) Fit System creates a custom-fitting helmet no matter what your head shape is. An ergonomically inspired three-point adjustable interface maximizes fit and customization with the twist of a dial. This allows for the ultimate convenience of being able to make fit adjustments on the fly. BIKE CERTIFIED: Certified by North American bicycle helmet safety standard and European bicycle and skateboard helmet safety standard. FULL WRAP LINER: A comfortable, washable, full-coverage, breathable liner design that wicks away moisture to prevent overheating and seamlessly integrates fit and audio systems. PASSIVE CHANNEL VENTING: Channels on the inside surface of the EPS direct air-flow between your head and the helmet, removing moisture and excess heat for all day comfort. HARD SHELL CONSTRUCTION: Hard-Shell helmets are built to last and will look good no matter how many trips they make in and out of your gear bag. Hard-Shell helmets protect you from impact thanks to lightweight EPS foam bonded to an injection molded and durable ABS shell.