The easiest way to keep your duvet clean (especially if the duvet isn't machine washable)? Protect it with a cover like the Solid Duvet Cover Set by Tache Home Fashion. If you haven't already tried, we recommend using a duvet cover in place of a flat sheet, making tangled sheets a thing of the past. This duvet cover slips easily onto your current duvet or comforter, and it stays put thanks to a zipper closure and security ribbon ties which prevent the duvet from shifting around inside. Machine wash on cold and tumble dry low. Please note that twin size comes with one sham and one duvet cover. All other sizes include two shams and one duvet cover.