flat sheets don't have elastic corners to tuck around the mattress, but instead are simply laid on top of the bed. They come in various sizes, including twin, full, queen, and king, and are made from a variety of materials like cotton, linen, and polyester, offering different levels of softness and durability. Flat sheets can also be used for other purposes, such as layering on sofas ... https://britdecor.uk/collections/flat-sheets