Apex™ Gel Foam Cushion, 20 x 16 x 3 Inch, 1 Each Therapy Mats and Pads 05 Mil thickness Style:Pair (Left & Right) 05 Mil thickness * 1 year limited (pumps and mattress) and 6 months limited warranties * Portable alternating AC DC pump allows the patient to be totally mobile * Rechargeable battery backup keeps system working for more than 7 hours per charge * Car adapter included Design cools and reduces body interface pressure: Dual density foam layers provides a soft top entry layer promoting direct interface with cooling gel pod and a higher density base layer for support and pressure distribution This top design brings the gel pod up close so you can feel the superior comfort and stability