system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do people get "used to" the cold?

I was just recently in a snow town and when I ask locals how they can be wearing a shirt, their response is usually, I'm used to it.
gpt
Body temperature regulation is controlled by a part of the brain called the hypothalamus (which also does a lot of other things). The "normal" temperature range where you feel comfortable is determined by what temperatures you are exposed to most often. But there's an even bigger range of temperatures that it's possible to feel comfortable at, and your "normal" temperature can move around within that range depending on your surroundings.