trimfit Boys' Big 3-Pack Cotton Crew (comfortoe) Socks 65% Cotton, 29% Nylon, 4% Spandex, 2% Rubber Imported Machine Wash 65 percent cotton/29 percent nylon/4 percent spandex/2 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