How To Use a Duvet Cover? A duvet cover is a large slip cover or shell that your comforter will slide into easily. Using a duvet cover is similar to using a pillowcase on top of a pillow except much bigger. One mistake people make when buying a duvet cover, is that you have to get one that is one size larger than your comforter so the duvet cover will slide on easily and have enough room. Duvet covers offer great benefits to keeping your inside comforter clean. It is much easier to wash your duvet cover instead cleaning the entire comforter every time someone spills or drops food. Duvet covers are very convenient to use for your bed, especially if you have small children or have someone in your family that is disabled. Food or drink messes can quickly be taken care of by changing the duvet cover and throwing in the wash. Also, try a pretty duvet cover for the guest bedroom. Your guests will always have fresh, clean bedding with decorative benefits. Duvet covers have decorative benefits too. You can change your bedroom design quickly by adding a new duvet that is full of color. If you are tired of your plain old comforter, then adding a duvet cover if the way to go.