Stay warm and comfortable during cold-weather outdoor activities with the Smartwool Men's Classic Thermal Merino Base Layer Crew. Built with 100% Merino wool, this heavy-duty baselayer crew top naturally regulates body temperature, manages moisture, and resists odors during high-exertion cold-weather pursuits. Upgraded with functional design updates, it features flatlock seam construction throughout to minimize friction and eliminate skin chafing, while shoulder panels eliminate top shoulder seams for smooth comfort under backpack straps. Designed with a slim fit that follows the contours of the body without restricting movement, the Classic Thermal Merino Base Layer Crew offers dependable warmth and performance for skiing, winter hiking, and cold-weather layering systems.