Acorn Slipper Sock: Comfort that's out of this world! Features The famous Acorn original that has been comforting the feet of astronauts since 1982 Ragg wool uppers of 85% wool, 13% nylon, and 2% spandex Lofty Acorn memory foam midsole over comfort cushion layer of featherweight EVA guarantees total comfort and therapy for feet Full grain leather sidewall and suede leather outsole for durable comfort Size Scale: XXS , Womens 5 1/2-7 XS , Mens 6-7, Womens 7 1/2-8 1/2 S , Mens 7 1/2 - 8 1/2, Womens 9-10 M , Mens 9-10, Womens 10 1/2-11 1/2 L , Mens 10 1/2 - 11 1/2 XL , Mens 12-13 XXL , Mens 14-15