A flat sheet is a large, rectangular piece of fabric typically used as part of bed linen. Unlike fitted sheets, which have elastic corners to snugly fit over a mattress, flat sheets are smooth and have no elastic. They are designed to lie flat on the bed, either directly on top of the mattress or underneath a blanket or duvet. Flat sheets are commonly used in both everyday bedding and... https://britdecor.uk/collections/flat-sheets