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74 .. I think the thermal reserve area of the human body is actually the butt. If you protect that area and your head and use a wool sweater/shirt under the wet coat that would be the best. A mylar bag would be better than a plastic bag. When I researched Blizzard survival bag I found they also make a mylar emergency parka. I’d just soon use tape on heat paks. Or have a hot tub waiting.