Cold weather dry camping. can it be outside for dry camping. Where I am going may get down to 12F and I will be runninh the heater

[SeaDawg 1,375]

It's quite true that closed cell foam provides better insulation,  as John says, by 50 per cent, or even better, r value, dependingon the material. And, a better long term choice.

We're also looking at things people "might have on hand."