Trading Cosmic Battleship From The Start

Even the rise and fall of the lungs have vanished?

What exactly is the principle behind this?

"This is way too powerful, not producing oxygen, not even needing to breathe, doesn’t that feel uncomfortable?" Someone couldn’t help but ask online.

But others had a stronger observational angle.

"Is it true that wearing this means you won’t ever fear drowning again?"

"I’m afraid you won’t be scared of high temperatures or cold anymore!"

"Outer Space can be reached, would one still fear heat or cold?"

"There should be no problem with lightning protection either!"

"I want it!"

"If we had such things during military training, wouldn’t it be awesome?"