Duvets reduce the complexity of making a bed, as it is a single covering instead of the combination of bed sheets, blankets, and quilts or other bed covers. The duvet itself fits into a specially made cover, usually of cotton or a cotton blend. The duvet cover is removed and laundered as often as the bottom sheet and pillow cases. The duvet itself may be cleaned much more rarely, and depending on its contents, may require specialist dry cleaning.
A modern duvet, like a sleeping bag, may be filled with down or feathers of various quality and cost, or silk, wool, cotton, or artificial fibers such as polyester batting.
A duvet is not to be confused with a comforter, a US term for what was traditionally known in English as an eiderdown but is now only rarely used in the UK. While comforters go on top of the traditional sheets and blankets, duvets are used by themselves.
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