I have put it in many parts of the car, both 6mm and 10mm. I have to say that the quality is much better than the ones from AliExpress and the rolls they sell for €25. Besides the fact that they were installed in a car that shakes the ground from the noise at idle, from the inside it feels like I installed a soundproofing material. I want to put a few more sheets in the tunnel and the floor. So far, I have put them on the front feet and half of the tunnel, through the doors, a bit on the ceiling, 6mm inside the rear fenders, along with the Chinese ones on the entire backrest and floor of the rear seats that were removed. In terms of temperature, it has only been tested in winter and I have to say that I didn't turn on the heater at all. It keeps the warmth inside and outside it was 2 degrees. We will see how it performs in the summer when it gets hotter