The portable Airhawk Seat Cushion promotes consistent blood flow in the legs and buttocks to minimize pressure points, which are the main source of numbness, pain, soreness, and stiffness. The cushion's polyvinyl core consists of individual, interconnected, adjustable air cells (controlled by a valve and pump) that allow the air to slowly transfer from cell to cell and thus evenly distribute body weight pressure. It's covered with a breathable, stretchable nylon/lycra-blend material.