Your body tries to reduce its surface so less is exposed to cold. Also body hair stands up maybe to help retain warmth.
It's left over from when we were hairy all over. Hairs which stand up trap air near the skin and allow it to stay warm, kind of the same principle as a down coat. Of course, few of us have enough hair for that to help, now. Except that guy I saw at the beach last summer... What makes the bumps on your skin when you are cold? - Yahoo!7 Answers::
8 postsGoose bumps, also called goose pimples, goose flesh, chill bumps, chicken skin which is why you get goose bumps when you're scared as well. when you see
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goose bumps::
or[goose pimples] {n. plural}, {informal} Small bumps that come on a person's skin when he gets cold or afraid. * /Nancy gets goose bumps when she sees a
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Why does the skin get Goose-Pimples when it get cold?