https://notes.utk.edu/Bio/greenberg.nsf/0/0765bb50d404455385256f0000680854?OpenDocument&Click= Goosebumps, you get'em when you are scared or cold. Why? Well what does a cat do to intimidate other animals? Fluff up its fur! Also handy for insulation (hint: air is a great insulator, look at vacuum sealed thermos).
Yea, so Intelligent Design, not so much.
Unless Adam was a very hairy son-of-a-bitch God.