The DONAMA side sleeping pillow has a double-layer high-quality pillowcase, which is soft and stretches and contracts well with the pillow core. It is removable, has a zipper and is machine washable. Made from hypoallergenic cotton and polyester, the pillowcase fits perfectly against the skin, and its soft, breathable fabric keeps you cool all night| This orthopedic pillow is suitable for all kinds of sleeping posture,such as stomach ,back ,side sleeping.