ROHO Mosaic Cushion is made of 3" interconnected air cells with a contoured design that better molds to the shape of your body. The three inner rows of cells are slightly smaller than the two outer rows of cells for a more comfortable fit. This adjustable air cushion evenly distributes weight, which helps protect skin and delicate tissue. It is easy to inflate and is available in a variety of sizes. This Roho cushion comes with a machine washable cover and an inflation pump.