Dual certification - complies with U.S. CPSC Bike and ASTM Skate safety standardsIncludes 2 sets of Sweatsaver™ liners to customize fitA portion of sales will be donated to the Tony Hawk Foundation to continue its mission of empowering youth through the creation of public skateparks in low-income communitiesBMX/SkateABS Hard ShellXS/SM 20 to 21-1/4` (51 to 54 cm)Black Halo10UPC/EAN/GTIN: 604352036610