If you've ever parked your car outside in direct sunlight and it's about 90 degrees out, you know what ends up happening 2 hours later when you get back into the car.
The car itself is hotter than hell, and your car seat is so hot it feels like it'll burn your tushie if you sit on it.
In the hot seat? Keep your car upholstery comfortable by throwing a reflective emergency blanket over it. Cool!