The pillowcases are made of pure cotton Please notice that insert is not included. Invisible zipper:Hidden zipper pillow case design,high quality zipper,beautiful and sturdy,pulls smooth,easy to clean and wear. Whether it match with a fabric sofa,a leather sofa,or a solid wood sofa,it will look decent and generous.It can also decorate the room bringing warmth and personality. It also can be machine washed or by hand.Maximum water temperature is 30 degrees,do not bleach,hang to dry,maximum temperature is 150 degrees. Anti-washing and not washing with dark clothes at the same time.