That only works if your legs and feet have good circulation. I tried this and while it worked for my upper body I just found my feet where still so cold(3 pairs of merino socks all too big so they didn't compress my foot) that I couldn't sleep. If you have have good circulation and don't get cold feet but probably something to consider. I'm going to try down booties next as it did save me about 400grams and was during that frozen snap a month or so.
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