Disposable Shower cap.

A shower cap (also known as a bathing cap) is a hat worn while showering or bathing to protect hair from becoming wet.

Designs are made from one layer of a waterproof material. Designs invariably contain an elastic edging to keep them in place. Shower caps are used in hair mask treatments or hair dyes. They trap in the heat so that the treatment or color sets in. Plastic bags are often used as shower caps. They are important beauty tools in spas. Shower caps are also worn when receiving a facial mask in a spa.