The Five-Letter Position Puzzle

I’m normally under you. Take away my first letter, and I’m normally above you. Take away my first two letters, and you normally can’t see me.
What am I?

A chair.

Explanation:

“Chair” is normally under you.
Remove the “C,” and you get “hair,” which is normally above you.
Remove the “H” as well, and you get “air,” which you can’t usually see.

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