Did an overnight snowshoe trip last week, I put some of the hand warmers in the toes of a pair of socks for in my sleeping bag overnight.
It was one of the most comfortable nights I have ever had in the bush I slept like a baby eventhough It was -10 and I was in my tent.
Only experience I have had with external warmers
I find the key to keeping my feet warm is to keep my hands and neck/head warm.
And keep moving, we all got a bit cold so we dug a snowcave to keep warm, we had to stop cuz we were all sweating.
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