In addition to warmth, there's some evidence to suggest that when we get goosebumps it's a fight-or-flight reaction to raise our hair up and make us look bigger all over and give a potential attacked some second thoughts about attacking us...of course, since we don't have solid fur on us it doesn't really have the same effect it would if we were as shaggy as a bear or dog.
Why we humans have hair all over the body??
It's a holdover from our ancestors. It actually did them some good by keeping them warm.
Why we humans have hair all over the body??
Some theories suggest that we have hair from when we were heavily furred, however our use of cloths has caused the hair to lessen over our entire bodies. The hair that we do have also serves to keep in body heat; although it seems silly, even the sparse short hairs that cover our entire body helps form a warm "blanket" over our skin that prevents heat loss. Hope this helped!
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