At flying J for $32 i bought a seat that has a mesh like cover outside of a flexy soft plastic "vented honeycomb" design. the cover is washable and comes with a second more meshy cover too. it seemed to help in 75 -80 degree weather without running the a/c. but i know it wont in the "hot" stuff. Without spending hundreds of dollars if not a thousand on and a/c seat, does anyone know of something better than the flying J cushion? i'd like to find something similar to a heating pad style you can sit on that cools. thats right a butt fan.