A comforter, also known as a doona in Australian English, or a continental quilt or duvet in British English, is a type of bedding made of two lengths of fabric or covering sewn together and filled with insulative materials for warmth, traditionally down or feathers, wool or cotton batting, silk, or polyester and other down alternative fibers. Like quilts, comforters are generally laid over a top bed sheet and used to cover the body during sleep. Duvets are another form of quilt, traditionally filled with feathers. Duvets originated in rural northern Europe and were originally made from the down of the eider (Somateria), a type of duck whose feathers are well known for their thermal insulation properties.