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These soft and stretchy unders are made from capilene, an insulating fabric spun from 100 percent recycled polyester. The synthetic threads perform about on par with wool. Capilene is also just about as comfortable, all while being light and quick-drying. Patagonia sells the base layers in two thicknesses: midweight and a heavier thermal weight. They come in men’s and women’s sizes, and the tops are available in a crewneck or collared zip-neck. I tested these in the fall in Minnesota and in San…
