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When it gets cold, the Smartwool Merino 250 Baselayer 1/4-Zip is the top we turn to when the resort's extra cold. Being one of Smartwool's heaviest merino baselayer options, it excels at thermal regulation in colder climates, and it reduces odor naturally for fresher comfort. Toss in the 1/4-zip functionality and we are equipped with a baselayer that gives us total control of our body temperature.