Size Chart Description 85% Nylon/7% polyester/5% rubber/3% spandex Heel/toe construction Wicks Moisture Extra cushioning and support in areas of the foot and ankle that are susceptible to rubbing, impact or injury Arch compression reduces fatigue and aids circulation Size Chart Youth (Small): For Shoe Sizes: YOUTH 12.5-7 and LADIES 4-5.5 Intermediate (Medium): For Shoe Sizes: MEN 4.5-7.5 and LADIES 5.5-10.5 Adult (Large): For Shoe Sizes: MENS 8-13