A duvet, without a cover. A duvet (/ˈdjuːveɪ/ , /ˈduːveɪ/ , or US /duːˈveɪ/ ; from the French duvet [dyvɛ] down) is a type of bedding consisting of a soft flat bag filled with down, feathers, wool, silk or a synthetic alternative, and typically protected with a removable cover, analogous to a pillow and pillow case.