trimfit Boys 3-Pack No Show Sport Liner (comfortoe) Socks 75% Cotton, 21% Nylon, 3% Spandex, 1% Rubber Imported Machine Wash 75 percent cotton/21 percent nylon/3 percent spandex/1 percent rubber Comfort technology Machine wash cold with like colors. Only non-chlorine bleach when needed. Tumble dry low. Do not iron trimfit. Wear tested and Est. Since 1921