Supportive, high-resistance foam base. Ergonomic, ventilated memory foam top layer. Air knit bamboo blend fabric cover. Cover is removable and machine washable. Available in various sizes. The supportive, high-resistance foam that makes up the base of the Rio Home Fashions 8 in. Memory Foam Mattress is topped with 3 inches of ergonomic, ventilated memory foam for added comfort. This luxurious, yet supportive bed is covered with a soft, breathable bamboo poly blend fabric that is removable and machine washable for easy cleaning. Size: California King.