Answer:
You use it between your head and your toes, the more it works the thinner it grows.
What zips through the sky with a tail of fire and dust. It could be an omen, its origin to discuss?
I cost no money to use, or conscious effort to take part of. And as far as you can see, there is nothing to me. But without me, you are dead.
Reaching stiffly for the sky, I bare my fingers when its cold. In warmth I wear an emerald glove and in between I dress in gold.
So cold, damp and dark this place. To stay you would refrain, yet those who occupy this place do never complain.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.