ABS Outer Shell paired with patented Conehead EPS liner technology results in a lighter helmet with greater energy displacement on impact Dual Certified: Complies with U.S. CPSC Bike and ASTM Skate safety standards Complete with the renowned Sweatsaver� Fit Pads for added comfort Adjustable Fit Dial System with reflective dial ensures a custom fit Grooved EPS for excellent air flow BMX/Skate ABS Hard Shell Small/Medium (55-58cm 21.7 to 22.8`) Gun Metal Dial Adjust