Triple 8’s THE Certified Sweatsaver Helmet for Skateboarding, BMX, Roller Skating, and Action Sports offers comfort and safety with high impact-absorbing EPS foam and thick dual-density soft foam Triple 8 Sweatsaver fabric liners. Dual-certified to comply with US CPSC bike and ASTM F-1492 skate safety standards, it’s the ideal helmet for biking, skateboarding, skating, roller derby, scooters, BMX, and other action sports. Two sets of moisture-wicking, stink-free Sweatsaver liners in two different sizes are included—mix and match for a customized fit. The plush terrycloth liners attach with hook and loop tape and can be removed for washing. Chin strap is adjustable and fastens with a side release squeeze buckle. The Triple Eight THE Certified Sweatsaver Helmet is available in four sizes to fit kids, youth, and adults: XS/S fits 20–21.25 in (51–54 cm), S/M fits 21–22.5 in (53–57 cm), L/XL fits 22.5–23.5 in (57–60 cm), XL/XXL fits 23.5–24.5 in (60–63 cm). Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older and ASTM F-1492 Skate safety standards. To determine proper size, measure around head with a soft tape measure or string.