The progression toward achieving a low-profile design without compromising any protection meets supremacy in a hard shell helmet. The K2 Thrive is clean and straightforward with the inconspicuous but well-performing Passive Channel Venting. Try it on, and you’ll find it’s also souped-up with the K2Dialed Fit System and a washable Full-Wrap Liner System for optimal fit and comfort. Construction A hard-shell construction made of a solid ABS shell and EPS foam inside offer protection even with a hard crash. Ventilation The Passive-Channel Ventilation gives you a perfect air circulation Fit System The K2Dialed™ 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 feature allows for the ultimate convenience of being able to make fit adjustments on the fly. Certification Bike Certified / ASTM F2040, CPSC (16 CFR 1203) / EN1077: 2007 (Class B), EN1078:2012 + A1:2012 FeaturesPassive-Channel VentilationK2Dialed™ Fit Systemwashable Full-Wrap Liner SystemTool-free removable goggle clipSummer Pad KitWeight: 500g