STYLE-UM@ Standard Size Custom Pillow Case, Mumford And Sons Pillowcase, Cotton Pillow Cover 20"x30" (one side) Material: 50% cotton, 50% polyester for comfort and durability. Standard-size pillowcase: measures 20"x30" One side customizable. COVER ONLY (INSERT NOT INCLUDED). An opening on the side allows easy insertion and removal of pillow inserts. 100% customer satisfaction guaranteed.