A bed sheet is a flat broad woven piece of cloth used for covering mattresses. Bed sheets are usually woven on broadlooms. Bed sheets are hemmed in on all sides with one broad seam which goes at the head of the bed. Bed sheets are available in sets as part of bed linens. Bed sheets come in many varieties and styles. Most bed sheets are dyed before being printed or stitched. Even white bed sheets are dyed before being packed for selling.