A durag (alternate spellings), silky, or wave cap is a close-fitting cloth cap tied around the top of the head. Durag may be worn to accelerate the development of long curly/kinky hair, waves or locks in the hair; to maintain natural oils in hair (similar to a bonnet); to stop hair breakage; or to keep hair, wave patterns and braids from shifting while sleeping. Durags are also worn as an identity-making fashion choice.