A bed sheet is a rectangular piece of cloth used either singly or in a pair as bedding, which is larger in length and width than a mattress, and which is placed immediately above a mattress or bed, but below blankets and other bedding (such as comforters and bedspreads). A bottom sheet is laid above the mattress, and may be either a flat sheet or a fitted sheet (a sheet which has been sewn with elastic or a drawstring along the hem of the top, sides and bottom of the sheet to prevent it from slipping off of the mattress). A top sheet, in the many countries where they are used, is a flat sheet, which is placed above a bottom sheet and below other bedding.
Satin sheets are made out of synthetic fibers and have an alluring feel. Like silk, adding satin sheets is an excellent way to spice up a room with some romance. When looking for these types of sheets, be aware of whether the satin is woven or knit. Woven makes the satin smoother, while knit adds a bit of roughness to it.