AirCell, a microcellular urethane spring, is a lower cost, no-maintenance product to reduce sag and improve ride in constantly loaded vehicles. Easy to install, most AirCell springs mount between the frame and axle/spring, in place of a jounce bumper. They provide a better ride than rubber load supports or steel overload springs, and are half the cost of most steel overload springs. Tough and long-lasting, AirCell springs are made from the same rugged material as factory jounce bumpers. AirCell is engineered by Air Lift, the air suspension leader, especially for vehicles that maintain constant loads such as work trucks, fleet, and delivery vehicles. They're great for anyone whose truck is always loaded, and wants load support and ride quality at a very affordable price. Rear AirCell kits keep heavily-loaded pickups level and greatly improve ride, while front kits provide support for trucks with snow plows or other heavy front equipment. All AirCell kits come standard with a limited lifetime warranty and an exclusive 60 day ride satisfaction guarantee.