Cotton & Polyester Soft Square Zippered Cushion Throw Case Red Lip Pillow Case Cover 18X18 inch (one side) Material50% cotton, 50% polyester High quality material giving the pillow a soft and comfortable texture. A great pillowcase to make you have sweet dreams everyday! A great pillowcase to make you have sweet dreams everyday! This standard pillowcase is roomy in size (18'' x 18'').