New Balance Thin Quarter Socks with Coolmax (2-Pack) polyester 57% Coolmax Polyester, 30% Polyester, 10% Nylon, 3% Lycra Spandex CoolMax Extreme Moisture Management Made in USA with Comfort Toe and Reinforced Heel and Toe Area Machine was warm with like colors. Only non-chlorine bleach when needed. Tumble dry low. Do not iron. Do not dry clean. Do not use fabric softener or dryer sheets. USA