The Stovebolt Site Forums The Shop Area General Truck Talk Firewall Insulation

I'm still trying to find the best firewall insullation available to stop engine HEAT from coming into the cab of my truck. I would think there is a "pad" type of material that can be cut and applied that can do the job. Someone has suggested the same material that NASA suites are made of, but I don't know what that is. Others have suggested fiberglass with foil on one side. Can anyone tell me of a pad type of product that they have used that is a really good product they are satisfied with?
Thank you!