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Polo Ralph Lauren has been outfitting team USA since 2008.

This year the U.S. fashion designer partnered with textile innovation company Skyscrape to bring to market a sustainably-minded temperature responsive fabric.

As temperatures drop, the fabric expands to increase the amount of insulation provided by the garment. As temperatures rise, the fabric contracts to provide a cooling effect.

Two-time U.S. Olympian bobsledder Aja Evans said the temperature responsive jacket is her favorite piece in this year's collection.

"What's really cool about the jacket is the intelligent installation technology. So instead of needing, like, to have warmth, when we go outside, it warms us up. And then when we're inside, it kind of helps keep us cool and maintain our body heat," she said. "So I think that's awesome. And all of the products within the collection are sustainable and so it makes me feel good that, you know, it's good for the environment as well."