The disposable shower cap is made of cornstarch and comes with elastic, durable, and comfortable elastic bands that support your hair. The waterproof shower cap is available in a variety of sizes. A 100% biodegradable shower cap is the perfect solution for hotels that strive to be environmentally friendly. shower cups bulk order Material: Biodegradable Corn Starch Size: 18 ,19 ,20 ,21 ,22 ,24 ³/Thickness:0.014mm-0.05mm Color: transparent, red, white, blue, yellow, purple, black