Custom Adam Levine Pillowcase Standard Size Design Cotton Pillow Case Standard pillowcase is roomy in size (20'' x 31''). Best choice as a gift. Comfortable and 100% Brand New Made of 50% cotton, 51% polyester! The pattern image is only on the front side. Custom Design Your Own Personalized Rectangle Pillow. Having this soft custom pillowcase will add both comfort and style to your home.