Answer:
Come up and we go, Go down and we stay.
I look at you, you look at me, I raise my right, you raise your left
Defends your noggin from the hard pavement
You have it even if there is none.
Touch this and you'll regret it. But if it's cold, you won't forget it. What is it?
I am a room that has a roof but no walls. What am I?