These medium weight Fox Sox made from durable prim aloft give you an edge like no other. Our helix fit forms to your feet supporting your every move while a cushioned heel and shin add comfort. Sizing: Medium (Shoe Sizes: Men"s 6-8.5; Women"s 7-9.5); Large ( Shoe Sizes: Men"s 9-11.5; Women"s 10-12.5), Extra Large( Men"s 12-14.5).