Galaxy Print Polyester 4-Piece Duvet Cover Sets (Twin) MATERIAL: Polyester ,High Thread Count and Fabric Density;Eco-friendly Reactive Printing,Won't Fade Easily;Touch Feeling Is Good and Won't Shrink After Washing. BEDDING CARE:Don't bleach it, machine washable in cold water on gentle cycle. DUVET COVER: A duvet cover is a protective layer that slips over the duvet and has a closure. Because duvets and comforters can be expensive and difficult to clean, duvet covers are useful because they protect your comforter during use and are easily removed and easy to wash.you can also quickly and easily change the look of your bed and room without having to completely redecorate.The duvet cover also allows you to change your style or color of your bedding with the simple switch of the cover. HOW TO USE THE DUVET COVER:1) Lay the comforter flat. 2) Insert your hands inside and find the two top corners. holding one corner in each hand. 3) With your hands inside the duvet cover, reach down to grab hold of the comforters top two corners. 4) Holding the top two corners tightly, give it a shake and a fluff until the duvet cover falls down to cover most of the comforter. 5) Stuff the bottom two corners of the comforter inside the bottom two corners of the duvet cover. zip it up at last!