"The Nike Free Hypervenom 2 has a sleek design and Nike Free technology to enhance natural motion. This mid style also features a textile and technical skin upper, bootie construction, asymmetrical lacing, and flex grooves on the outsole for maximum flexibility. Fabric Rubber sole Ventilated synthetic upper with perforations for lightweight comfort Flex grooves for more natural movement and an extraordinary feel Strategically placed carbon rubber on the outsole for enhanced durability Cushioned collar for protection around ankle"