The Women's Muk Luks 3 Pair Over the Knee Sock Packs are the perfect accessory for those fashionable boots sitting in your closet. These fashionably patterned socks are made of 80% Polyester Microfiber, 17% Nylon, and 3% Spandex. This pack is available in one size fits most and should be machine washed on gentle cycle, no bleach, and laid flat to dry. Made in China. Material: Polyester, Nylon, Spandex.