How do Heat Sheets do when laid directly on snow, even in a snow cave?
A heat sheet might prevent melted snow from soaking into your bag and clothing but it will provide zero insulation value.
I would second that opinion.
Just so that it's clear, my intention when I originally mentioned the AMK Heatsheet was to use it as a blanket (windbreak) and not as a ground cloth. While I can only guess, my feeling is that these folks were considerably underdressed for the conditions that they were in.
Jim
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