Why do we get "goose bumps"?

Why do we get "goose bumps"?

Professor Gizmo (Amazing Science Presentations) gives expert video advice on: What is my body made of?; Why do we get "goose bumps"?; How do I catch colds? and more...

Goose bumps are a little leftover thing from our ancestry. If you look at your arm, there's hair on it. When you get a goose bump, the hair actually stands up on a goose bump. And what the goose bump was designed to do was to stand up, and when the hair stands up, it creates a layer of trapped air on our body and keeps us warm. So, when we are chilled we'll get a goose bump and our body is usually reacting to the cold, and trying to insulate us by having our hair stand up on end, trap the air, and trapped air makes a good insulator, and keeps us warm.