ASICS Women's Tactel Microfiber Low Quarter Running Sock (3-Pack) (Assorted,Medium) 37% Nylon 31% Tactel Nylon 29% Sorbtek Polyester 3% Lycra Spandex Tactel provides the ultimate in microfiber softness, offers outstanding moisture management in a breathable, lightweight product. Knit-in arch support helps secure the sock in place on the foot, providing a more comfortable fit. Machine wash warm, Tumble dry low, Do not bleach Made in the USA