"The AIRHAWK seating system uses fully adjustable air-filled individual cells controlled by an innovative air valve and pump to distribute seating weight evenly. This revolutionary air-filled cell technology reduces pressure points which are the main source of numbness and back pain. Ideal for those driving trucks, tractors and forklifts on a daily basis. Durable polyvinyl material with breathable, stretchable nylon/lycra blend cover. Dynamic air cells won't harden or compress like foam or gel cushions. Measures 19in. x 19in. U.S.A. Compatible With Trucks, tractors, forklifts, Color Black, Dimensions L x W x H in. 19 x 19 x 2, Water Resistant Yes, Includes Dynamic, Recommended Use Seat cushion, Material Type Polyvinyl material w/stretchable nylon/lycra blend cover."