The Russell Athletic All Sport Sock is designed with the athlete in mind, allowing them to perform at their best during competition. It is made of moisture management properties and features a reinforced toe, arch support and mesh for ventilation. Each pair features left and right indicators, as each sock is specially constructed for the specific foot. This sock, which comes in sizes XS-XL, is sold by the pair.Sock Size Guide (Sock Size): XS 6 and under, S 6-9, M 10-12, L 13-15, XL 15+ and up