[Bentblazer]

As said above by mcmlix bed liner materials are not a heat barrier but Lizzard Skin is made up different, it does claim to be a heat barrier. I can't testify to that claim but others can, I have Al's Liner on my complete floor, looks good but it's hot. Most likely due to the motor/exhaust heat, truck has no lift which may give you a little better air flow. If I were to do it again it would be Lizzard Skin underneath cab then carpet and pad. And thats just one option.