Do covers are a type of protective headgear that is worn in certain work environments. They are usually made of a lightweight material such as nylon or polyester and are designed to cover the hair and scalp. HAIRNETS are a type of do cover that is typically used in food service, medical, and industrial settings to keep hair from falling into food, medical equipment, or machinery. HAIRNETS are usually secured with an elastic band or drawstring and come in a variety of colors and sizes.