Review on Siless Liner 314 mil 18 sqft Aluminum Foil Finish Sound Deadening & Heat Insulation Closed Cell Foam - PE Foam Sound Deadener for Cars by David Ruwala

I was doing the headliner on my Saturn car and found there were empty pockets between the headliner and the roof. I filled them in while waiting for headliner material. Sonic foil is very easy to cut and shape properly so I had no problem filling the space. I think it helped a bit against the noise, the roof isn't the best place, but I'm more hopeful that the car is a little better at keeping the cabin warm and cool.