Hot seats are one reason I am strongly opposed to owning a car or truck with either leather or vinyl seats. The guys at the Jaguar stand at the car show looked at me like I was insane when I asked them if you could get a Jaguar with cloth seats! Vinyl is probably better because it won't soak up the sweat I will inevitably develop after an hour or so in the saddle, AC or no AC. Vinyl can be cleaned, but leather will let it soak in. And I don't want to think about how it would smell in there after 200,000 miles of me sweating in the seat! Cloth seats breathe enough to allow a little air circulation, just enough to keep me cooled. Cooled leather seats might work, though.