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In the outdoors, the way to deal with cold is not to heat the environment, but to insulate yourself. You say "snow line", so it appears you aren't asking about anything particularly cold. Just ge...
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#1: Attribution notice removed
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System
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2020-06-03T15:54:26Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/19336 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/