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bed sheets (also known as a "flat bed sheet") is a type of bedding— a large rectangular piece of cotton or linen cloth bed cover. It is this sheet that one typically lies on. They were traditionally white, but now often various colors and patterns are used. They are larger than the bed, so they can be tucked under the mattress in order to be kept in place. The quality of bed sheets is often conveyed by the thread count - the number of threads per square inch of material. The higher the thread count, the softer the sheet.

A "fitted" bed sheet is not a simple flat cloth, but is sewn to match the shape of the mattress. The corners are fitted with elastic so they can be stretched over the mattress, and then the edges can be tucked under the mattress. Sometimes confused with a comforter, it is usually found under a comforter, but over the mattress cover.