Size Chart Description 79% Polypropylene/13% nylon/6% elastic/2% lycra® spandex wicking yarn Arch compression Ergonomic cushioning Breathable mesh Double welt top Heel/toe design Size Chart Small: For Shoe Sizes: YOUTH 12-5 and LADIES 4-7 Medium: For Shoe Sizes: MEN 6-9 and LADIES 7-10 Large: For Shoe Sizes: MEN 9-12 and LADIES 10-13 Extra Large: For Shoe Sizes: MEN 12-15 and LADIES 13+