A Bouffant Cap is a hat whose function is to keep stray hair in and water or other contaminants out. It resembles a bag with a gathered elastic opening that covers the hair and fits snugly around the hairline. The cap is a light cap used by doctors while performing surgery to prevent hairs from falling out. This is not merely used for one reason, but it is used for various purposes. The Bouffant Cap is made for use in the various places.