A full bedding set typically contains a fitted sheet, a flat sheet, and one or two pillowcases. Some sets also include a comforter, quilt, or duvet. Most full bedding sets are designed to fit a standard full-size mattress, which is 54 inches wide by 75 inches long. However, there are also sets available for extra-long full mattresses (also known as double beds), which measure 54 inches wide by 80 inches long.