K2 Thrive Ski Helmet Construction: Hard-Shell Features: Passive-Channel Ventilation, K2Dialed Fit System, Washable Full-Wrap Liner System, Tool free removable goggle clip, Summer Pad Kit Certification: ASTM F2040, EN1077: 2007 Class B, CPSC 16 CFR 1203, EN1078: 2012+A1:2013 Weight: 500g