A flat sheet, also known as a top sheet, is a rectangular piece of fabric used in bedding. Unlike fitted sheets, which are designed with elastic corners to snugly fit over a mattress, flat sheets are simply laid flat on top of the mattress or used between the sleeper and the blanket, duvet, or comforter. Its primary purpose is to provide a clean layer that separates the sleeper from o... https://britdecor.uk/collections/flat-sheets