Customized Zippered Pillowcase Pillow case Cover 20 x 20 Inch (One Side) Cotton Linen Pillow Protector, Best Pillow Cover 20161023 Brand: Densiy Dimensions: Approx.20"*20" Made of cotton linen material The pillow cover is made with color matching invisible zipper that allows easy insertion and removal of pillow inserts. Hidden zipper design, Safe to machine wash