Triple 8's THE Certified Sweatsaver Helmet with Visor for Roller Derby, Skateboarding and BMX was developed with top roller derby skaters across the league, from Gotham Girls, Rose City, and Team USA—and proven at WFTDA (Women’s Flat Track Derby Association) Championships. The helmet is dual-certified and complies with US CPSC bike and ASTM F-1492 skate safety standards. Ideal—not only for roller derby—but also for BMX, biking, skateboarding, and skating. Each helmet includes two sets of Sweatsaver liners to customize fit. The visor lens is constructed of CE-certified impact resistant polycarbonate with hi-definition optics for distortion-free optical clarity. The lens features anti-scratch and anti-fog coatings, with additional venting channels to ensure clear vision in the heat of the bout. Comes fully assembled. Includes a soft bag for safe storage and a microfiber cleaning cloth. 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 Eight THE Certified Sweatsaver Visor Helmet is available in four sizes to fit kids, youth, and adults. To determine proper size, measure around head with a soft tape measure or string.