What is physically happening when a body grows acclimated to temperature extremes?

[Mangetout]

Here’s a previous thread that contains some useful sources

"getting used to the cold weather"--What's the physiology?

I hate cold weather, and feel the pain more severely than most people. If I am outdoors in weather below 50 degrees F (10 C), I wear long underwear and a heavy coat. (yes, I’m a very thin guy) I like to joke that any time the temperature is below 98.6, I feel cold. There’s a thread running right now in IMHO , from a southern person asking advice on how to handle winter when he moves north. And many of the answers say “you get used to it”. Now my GQ question is in the title.: HOW does yo…