Nice thing is, after a bit of time the igloo reaches 0C and you are protected from the -30C. Also no air movement. The 6-8 hour hot packs are handy for when lounging, when bought in bulk. It is a time to wear PJ's while in a sleeping bag though!
Love the technique of the dome tent form! Another thing to try if I'm somewhere within range of a lake, river or water hose. I go now to think of forms to use other than my tent..!
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