Power Cushion Performance Crew Large 6 Pair Pack (White) 71% Cotton / 18% Acrylic / 10% Nylon / 1% LYCRA spandex Made in USA Machine wash warm. Only non-chlorine bleach when needed. Tumble dry medium. Size : Mens Large / 9-12 Stay-up, comfort top Comfort toe seam, Reinforced Heel and Toe Full cushioned foot, Ultra Soft Cotton Made In the USA