Memory foam base is covered with an internal cover and they are placed in a luxury removable machine washable black plush velour cover Covers are waterproof for easy cleaning and safe for washing on low settings; Drying on low heat or Air drying is recommended Memory Foam Cushion is designed to provide therapeutic comfort for sitting, even for prolonged periods of time Featuring an all-over rubberized, non-slip base, the memory foam pillow offers secure positioning to make sure you are safely seated in one place.