Dual Certified: Complies with U.S. CPSC Bike and ASTM Skate safety standards ABS Outer Shell with EPS liner Adjustable fit dial system to create a custom fit Pinch Saver padded chin strap for comfort and to prevent buckle pinching Toddler to 5 Years Old (46cm � 53cm) BMX/Skate ABS Hard Shell X-Small/Small Blue Dial Adjust