Duvet

A duvet, usually called a comforter or (down-filled) quilt in American English, and a doona in Australian English, is a type of bedding consisting of a soft flat bag filled with down, feathers, wool, cotton, silk, or a synthetic alternative, and is typically protected with a removable cover, similar to a pillow and pillow case. Sleepers often use a duvet without a top bed sheet, as the duvet cover can readily be removed and laundered as often as the bottom sheet.