Our bodies make heat all the time because of our metabolism, and have to get rid of it. Your skin and fat are insulators that help keep heat in, too. So temperatures where it is easy to get rid of heat at about the same rate we make heat feel comfortable. Our bodies can adjust how much heat we get rid of by various means. This is why a range of temperatures feels pretty good before we get too hot or too cold, and why when we go from a bit warm to a bit cool it takes a second to adjust but then feels okay.
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