The Bell Helmet sets a new standard in skate-inspired helmets with superior style, fit and comfort. Signature colors from Tony Hawk along with eight other inspired designs for Safety and caution for the ultimate skateboard experience. Weight: 15.0oz / 426g. Vents: 12. Sizes: Small (51-56cm), Medium (54-59cm), Large (58-63cm). Certification: CPSC, ASTM 1492.