Power Cushion Performance Crew Large 6 Pair Pack (Black) 70% Cotton / 19% Acrylic / 8% Nylon /2% Polyester / 1% LYCRA spandex Made in USA Machine wash warm. Only non-chlorine bleach when needed. Tumble dry medium. Large - Men's Shoe Size 9-12 / Women's 10+, X-Large - Men's Shoe Size 12.5+ Stay-up, comfort top Comfort toe seam, Reinforced Heel and Toe Full cushioned foot, Ultra Soft Cotton Made In the USA