These compression socks by Gold Toe are made out of 90% nylon and 10% spandex. Features include a non-binding top for comfort, contoured shape decreasing the pressure from your ankle to your knee, a non-restrictive heel and toe pocket as well as built-in stay-up design. Never settle for less than the best and go with Gold Toe! Medium fits shoe sizes 7.5-10, Large fits shoe sizes 10.5-12.