Despite our best efforts, babies leak. Disposable diapers are the worst but even cloth diapers and plastic pants will occassionally leak. This is why everything in babies crib should either be washable or waterproof. These waterproof zippered pillow covers provide necessary protection in the crib. They come in three sizes to fit any pillow you might put in the crib for baby. They are made of our most durable PVC, the 7 mil milky white. Since they should be covered by a pillow case they are only provided in this one milky white plastic and no nursery prints.