Jia Tai Jiatai Men's Elasticity Gauze Transparent Underwear Bottom This product is made of 90% Nylon and 10% Spandex. Colors: black, white, red, ivory, green Machine Wash.Better to machine wash cold and tumble dry low. Used only non-chlorine bleach when needed. No fabric softener. Do not iron. Ultra Soft and Comfortable Great to be Wear Alone at Home or Add an Extra Layer of Warmth Under Your Clothes