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I'd probably go with a foam roll mat under you, as your biggest heat loss well be conduction through the metal bed. As the space isn't that great, the cap shouldn't need insulation, but this will ...
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#1: Attribution notice removed
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System
·
2020-05-27T11:08:44Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/4783 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/