Patented durable polyvinyl overlay designed for individuals at risk from skin breakdown andor who have a stage I or II skin ulcer. Non powered multi zoned adjustable mattress system features interconnected air filled cells that are easy to set up inflate and adjust. Requires no external power source. Lightweight durable and easy to clean. System comes in three sections each weighing 2 lbs and measuring 27 x 35. Air cells measure 6.5 x 6.5 x 3.5. Fits a standard hospital or homecare bed.bed. 12 month limited warranty.