I'm actually more of a cold turkey experimenter. I started running barefoot more consistently only this September (discovered it accidentally on my own a few years ago). But I can state that it has done good to my ruined knees and I'm definitely a lot more resistant to catching colds.

I have, however, somehow always loved really cold weather (I'm in Estonia, so winters around -20C are nothing too special here; this year, however, it has not gone below -7C yet. No snow yet, either.)

But I do find this guy really interesting: http://barefootrunner.org/winter/wbfr_article_110610.htm

Also, a random thread on frostbite: https://www.thebarefootrunners.org/threads/frostbite.1479/

And another on hookworms: https://old.reddit.com/r/BarefootRunning/comments/14s6m8/lea...