Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older and ASTM F-1492 Skate safety standards Ideal for biking, skateboarding, scooters, BMX, roller derby, and commuting Includes two different sets of removable, moisture-wicking Sweatsaver Fit Pads to customize fit; adjustable chin strap with side release buckle Size XS/S fits 18.9 – 21.25 in (48 – 54 cm), S/M fits 21.5 – 22.75 in (55 – 58 cm), L/XL 23.25 – 24 in (59 – 61 cm); manufacturer’s 180-day warranty bmx helmet, skateboard helmet, protec helmet, roller derby helmet, bike helmet, skate helmet, skating helmet, skateboarding helmet, kids helmet, youth helmet, scooter helmet, boys helmet, girls helmet, adult helmet