Polyester ❤Waterproof: The material is 100% polyester, which is durable and lightweight. Surface of the pillow cover is a high-tech waterproof coating which can effective against water spillage. Not 100% waterproof, but water stains and red wine stains are easily wiped clean by napkin. ❤Hidden zipper: In order to make the pillowcase more beautiful, we use a hidden zipper design, you can find it at the seam joint. The zipper is strong, smooth, long enough, making it easier and faster to put in the insert. ❤Without insert: Please pay attention that our pillowcases without insert, you could buy it by yourself, 18X18inches will be suitable. ❤Perfect for: Home decor, festival decor, Christmas, bedroom, sofa, car, chair, bar. Excellent stain resistant ability can effectively help protecting your pillow cover. ❤Measurement: Each cover is unique and handmade. Please allow 1-5mm differences due to manual measurement. Waterproof: The material is 100% polyester, which is durable and lightweight. Surface of the pillow cover is a high-tech waterproof coating which can effective against water spillage. Not 100% waterproof, but water stains and red wine stains are easily wiped clean by napkin.