The Aqua Aire Seat Cushion with Adjustable ComfortThe Aqua Aire seat cushion has been ergonomically designed in a "U" shape to perfectly fit the contour of a person"s body for optimum comfort. The cushion has an insert through which the user can fill it with water. Air is then blown into the cushion for a desired firmness. Finally, a high-quality zippered cover is also included for the exterior of the cushion.