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When we plan on going hard in freezing conditions, we bust out our Icebreaker Zoneknit Insulated Hoodie to keep us warm--but not too warm. Winter warriors know that Merino wool makes the best baselayer for high-output activities because it naturally resists odor, wicks moisture, and dries quickly, preventing the winter sweat that cools off and drags down our core temperatures. The ZoneKnit construction then dials up extra insulation where it's most needed--the chest--and dials it down where it's not, mixing insulation with ventilation to keep us drier and more comfortable. When the temperature plummets and wind starts whipping, we can also pull up the balaclava-style hood to protect our face and stay out longer on the trail or mountain.