Dual certified, urban-style helmet for skateboarding and biking features a vented ABS shell with a subtle brim, and an impact-absorbing EPS liner Conehead liner construction has collapsing cones that absorb energy and spread force sideways within the helmet; ideal for biking, skateboarding, rollerblading, BMX, 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 sets of removable, moisture-wicking Sweatsaver Fit Pads, and an adjustable dial system and chin strap with side release buckle for custom fit Size XS/S fits 18.9 – 21.3 in (48– 54 cm), S/M fits 21.7 – 22.8 in (55 – 58 cm), L/XL 23.2 – 24 in (59 – 61 cm); manufacturer’s 180-day warranty PRO TIP: If your measurements are in-between the sizes shown or you’re simply in doubt, we strongly recommend sizing up to the larger size. We have found over the years that customers do better when they choose the larger size