Custom Teenage Mutant Ninja Turtles Zippered Pillow Cases 20''x30'' (Two Sides) It's a zippered pillow case, with a zippered opening on the side. With pre-shrunk fabric, this pillowcase is washable at 60. 50% cotton, 50% polyester. The material is made of a fine soft blend of fabrics, giving the pillow case a soft and comfortable texture.