O'Neal Sierra II HelmetO'Neal Sierra II Helmet, featuring polycarbonate/ABS construction, is designed for more aggressive adventure riding and varying terrain. The Sierra II Helmet includes an integrated face shield and a shorter peak visor for more diverse functionality.Features: Shell isconstructed from ABS Moisture wicking, removable/washable air channeled comfort liner Vent holes for optimal ventilation Integrated face shield Height adjustable helmet shield Padded chin strap with double-dsafety lock Meets DOT and ECE 22.05 The ECE 22.05 (Economic Commission for Europe) standard is quite a bit younger than the current DOT standard, and in many ways offers a more comprehensive battery of testing than its American cousin. ECE standards test for safety features that can contribute to avoiding an accident altogether, such as the optical quality of approved face shields and safety factors not directly related to impact, such as shell rigidity. Unlike the DOT, every ECE 22.05 certified helmet model must actually be tested against the standard by an independent lab before it is available for sale with an ECE sticker. safety standards Designed for Street, Enduro, Side by Side and Adventure riding