You is Kind You is Smart You is Important Decorative Square Zippered Throw Pillow Case Cushion Cover 18x18 Inch Made of polyester fabric. The pillow case has an opening zippered on the Side. Custom Zippered Pillow Cases 18x18 Inches. Print on one side. Perfect indoors and outdoors decoration makes the pillow a perfect match in any room. Hidden slide fastener design for good looking and easy to machine wash.