Durags originally served as a way for black men to protect and style their hair overnight. Guys wore durags to keep their hair from getting messed up while sleeping. Men with cornrows wore durags to prevent friction, frizz, and flyaways.
A durag not only preserves the brushing but through consistent wearing, gives the effect of “waves” wherein your hair creates a radial effect from the crown.
A durag helps keep your hair in position overnight. And it locks in the moisture to hydrate your scalp. Truly dedicated guys always wear their durags. Only on very special occasions would you actually see their obsessively curated waves.