Single Cab Sound Insulation?

[LS1GMCTruck]

Whats the best brand & type of sound insulation sheet material, to use in my single cab? And where can it be bought? thanks

[sierraman]

i used 50sq. of fat mat, it is thicker than dynamat but not as thick as dynamat extreme. i did my doors, floor, back wall, and roof.

http://www.fatmat.com/