Helmet with MIPS technology that reduces rotational forces during impact ABS shell with EPS liner is engineered for fit and profile; a low friction layer allows the helmet to slide; ideal for biking, skateboarding, longboarding, BMX, roller derby, and commuting Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older and ASTM F-1492 Skate safety standards Includes two different sets of removable helmet pads to customize fit; adjustable chin strap with side release buckle Size 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); manufacturer’s 180-day warranty