A comforter (in American English), also known as a doona in Australian English, or a continental quilt (or simply quilt) or duvet in British English, is a type of bedding made of two lengths 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 sometimes also blankets). Duvets are another form of quilt, traditionally filled with feathers, though since the late 20th century often made of synthetic fibres or down alternatives. (source)