To answer your question, I think there is a jacket that uses a reflective layer, it's an electric motorcycle jacket. I can't remember which one though since I really don't have a need for those down in San Diego....my perforated leather jacket works fine unless I ride the mountains in the winter.

Thanks for bringing up this topic. I was planning on making a vapor barrier for my sleeping bag. Now I'm thinking I'll make it out of this stuff. This stuff is cheap too.
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