They are made of Vinyl, which will make you sweat in the summer. Plus any plastic lower than furniture grade will crack in the sun, and tear easily. The fleet versions of Rangers have plastic seats, and they suck in Florida. I used to have a set similar to that before I had my truck, and replaced it with ones made of denim.
I would save my money for a set of Wet Okole's. I hear they are by far the best.