When it gets too hot, humans sweat, when it gets too cold, they shiver. How does the body regulate its internal temperature at those mild climates where a person can wear anything from a few layers to nothing at all without feeling a major shift in comfort level?
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Not mentioned in other answers: hair follicles. Your body hair traps air and provides a bit of insulation. When you’re slightly cold, muscles in each body hair follicle contract making your body hair stand up, trapping more insulating air near your body, which keeps you warmer.
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