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Patagonia

The most substantial base layer in Patagonia’s synthetic division, the ninja hooded, high-collar one piece is all you’ll ever need for cold weather core warmth. By design it removes extraneous seam build up, while simultaneously eliminating any chance at plumber’s butt—though the drop seat capability keeps things civilized. And efficient.  Built with Polartec Power Dry fabric, the Onesie wicks moisture away from the skin, breathes for high-output pursuits, and is utterly adaptable for heavy- and light-duty cold-weather activities. $199