I am thoroughly confused on the footbox insulation suggestions here and would like to look at it from a product standpoint. I see the following being used.

1. Thermo-tec cool it. This is basically a butyl layer with foil.

2. Breeze Pre cut - This does not appear to have a foil layer but i would guess is using a closed cell foam layer. Can someone confirm?

3. Reflective Foam Insulation - This appears to be foil faced closed cell foam.

The options above all vary in approach.
Do we need the foil facing?
I would assume closed cell foam is much better than butyl for insulation.

Is there a peel and stick product that has both foam and foil? I can find a foam and butyl combined type but not foil.