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Some people completely overlook underwear as the foundation of their layering. Big mistake. Don’t ruin great layers with average undies. These men's and women's superfine, soft and comfortable Merino thermal underwear are odor resistant, moisture wicking and naturally temperature regulating – so they’ll keep you warm when it’s cold, but also stop you overheating when it warms up. Perfect for cold weather and traveling light. Shop men's boxers, women's boy briefs and racer back crop tops at ioMerino.