The Triple8 Dual Certified Helmet takes that classic, iconic skate shape and streamlines it to give it a modern edge. It's the perfect combination of great style, fit and protection. Built with an ABS outer shell with an EPS liner to provide maximum support, protection and impact absorption. It also features Triple8's renowned Sweatsaver Fit Pads for added comfort. The Triple8 Dual Certified Helmet is certified for both skate and bike use, certified to CE EN 1078 European Safety Standards. Size guide: X-Small/Small: 18.9" - 21.3" (48 - 54cm) Small/Medium: 21.7" - 22.8" (55 - 58cm) Large/X-Large: 23.2" - 24" (59 - 61cm)