Klymit Ulaar Jacket uses gas for insulation

The Klymit Ulaar Jacket doesn't puff you out like a down jacket, and it doesn't make you pile on sweaters like a shell. Instead, it serves as both shell and insulated jacket using an innovative insulator: argon gas. You can pump the jacket full of gas (insulation) when you're cold and let some of the gas out when you're warm.

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