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When you live, work and play in a place where all four seasons can happen in any given day, real world testing can and does happen every day— and by calling the Colorado Rockies home, that's exactly what SmartWool does. It's because of this that they're able to make their products smarter, more comfortable, and more capable. At the heart and soul of every SmartWool product is the amazing fiber they use: nature's finest Merino wool. Used properly, it's the best fiber available for outdoor apparel — manages moisture better than cotton, smarter than synthetics and more comfortable in any weather condition. In their hands, it becomes extraordinary