Patented, durable polyvinyl overlay designed for individuals at risk from skin breakdown and/or 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. 6-month limited warranty.