This weekend I had a light rain coat folded and laid acrossed the asending section of the tranny **** inside my 95 bronco. I was driving about 40 minutes when I stopped and removed it. I noticed the jacket was quite warm and when I put my hand over that floor section it was very warm to the touch. I have the XL version with the rubber mat flooring. Is because it's not carpeted the heat is more noticeable? :-"