Rocket Rider (SpellJammer)

Being in space away from your ship allows you to think clearer than your allies, and your ability to maneuver isn't hindered by the pesky lack of gravity.

Increase your Constitution score by 1, to a maximum of 20.
You roll with advantage on ability checks and saving throws when in zero gravity.
Your air envelope lasts twice as long in zero gravity. This does not include when on a ship or planet.
You can go without food and water for twice as long.
When in an environment of extreme heat or extreme cold, you have advantage on constitution saving throws made to
avoid exhaustion.