A duvet cover is a protective covering for a duvet, which is a thick and soft quilt filled with feathers, down, or other synthetic materials. The cover acts as a removable and washable shell that encases the duvet and provides an additional layer of protection against dust, stains, and wear. It is typically made of fabric and features a closure, such as buttons or zippers, to secure the duvet inside. Duvet covers also offer the opportunity to easily change the style or color of bedding without replacing the entire duvet. A type of bedding, a soft flat bag filled with down or feathers, used on a bed as a blanket.