Made to go right on top of your existing mattress. The air overlay cradles the body, providing protection and treatment for pressure ulcers; also recommended for pain management. The overlay is easy to transport, cleans with soap and water and is extremely comfortable. Features a patented design to eliminate "bottoming out," air venting holes to dissipate heat and moisture, and a low profile design for greater stability and patient safety. The low-profile mattress design ensures patient safety.