Longer wider and taller than any other Purple Cushion the Ultimate Cushion fits a variety of fannies and seats providing maximum comfort for all especially when sitting for hours on end. Our seat cushion is made of Hyper-Elastic Polymer that is not only durable but also gives the exact comfort your tush needs. It s made to be extra thick and soft with a grid designed for optimum pressure relief and comfort. Also integrated free-flowing air ducts maintain a neutral temperature.