The Triple 8 Dual Certified MIPS Helmet for Bike, Skate, Longboarding, BMX, and Commuting features classic Triple Eight style and fully-loaded technology. Dual-certified for both bike and skate, it also has patented MIPS technology that reduces rotational forces during impact. An ABS shell with EPS liner, engineered for a close fit and low profile, is separated by a low friction layer that allows the helmet to slide when subjected to an angled impact. Ideal for biking, skateboarding, longboarding, BMX, roller derby, and commuting, the helmet complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older and ASTM F-1492 Skate safety standards. The Triple 8 Dual Certified MIPS Helmet includes two different sets of removable helmet pads to customize fit, and has an adjustable chin strap with side release buckle. Available in three sizes: XS/S fits 19.7 – 21.5 in (50 – 55 cm), S/M fits 21.5 – 22.75 in (55 – 58 cm), L/XL 22.75 – 24 in (58 – 61 cm). To determine proper size, measure the circumference of the head starting in the middle of the forehead (use a soft measuring tape or string). Helmet liners should be used to further customize the fit.