I went skiing for 3 days in Jackson Hole, Wyoming (one of the coldest places I know of) in these and I've never been warmer. The are thick but not bulky and so soft! I am 5ft 3in, 120lbs and the small fit me perfectly!
I loved these so much I'm going to order two more. Perfect for winter running or for a warm layer under jeans. It's just the right thickness, not so thin like silk but breathable and lightweight enough to run in. I liked the fit, snug but not tight.
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