What is the best sound mat to use on the roof, both from noise and adhesion? I have searched all the threads but nothing seems to talk about which is best for adhesive holding up in hot weather. Don't want it sagging onto the headliner.

Thanks....

 

I'm going to be trying Dynamat. The factory stuff was sagging into my headliner and barely hanging on, didn't notice until I removed the headliner. I was going to hit it very lightly with 3M spray adhesive just to be sure it sticks.