Fitted sheets, bottom sheets, are used to cover the mattress and provide a smooth and soft surface for the sleeper to lie on. History In 1959, Bertha Berman patented a design for fitted sheets that had corners sewn in a way that would fit the sheet to the mattress. Although these sheets were still less
Both the flat and fitted sheets come with top as well as bottom sheets. However, do you know the difference between flat and fitted sheets? The flat sheet, which is also called the top sheet contains no elastic on the edges, usually goes on top of the fitted sheet and comes between the sleeping person