PRICES MAY VARY. Polyester,Cotton,Spandex 75% Combed Cotton, 20% Polyester, 5% Polyester Spandex Unisex Small: Shoe Sizes: 5.5-9/Sock: 9-11 Large: Shoe Sizes: 8.5-12/Sock: 10-13 Each purchase helps to fund literacy programs and book donations to communities in need. Matilda socks. Cotton-poly blend socks. Each purchase helps to fund literacy programs and book donations to communities in need.