Custom Calvin And Hobbes Pillowcase Standard Pillow Protector Cover 20"x30" LLP-1644 Custom your own pillowcase from us. This pillowcase used 50% cotton and 50% polyester.Without buttons. This size of the pillowcase is 20"x30" style to your bedroom or sofa. Custom Pillowcase is a sweet gift for some one you like Having this soft custom pillowcase will take you comfort and sweet dreams.