The Smartwool Men's Intraknit™ Thermal Merino Base Layer Colorblock Crew Shirt is a heavyweight performance base layer built to keep him comfortable during demanding cold weather adventures. Engineered with advanced Intraknit™ technology, it seamlessly combines insulation, articulation, and ventilation for outstanding mobility and temperature regulation. The Merino wool blend naturally manages moisture and resists odors, while strategically placed mesh zones enhance breathability during high-output activities. A slim, 3D-knit construction delivers a near-custom fit that moves naturally with the body, and ribbed elbow reinforcements add durability for seasons of dependable performance. Whether skiing, hiking, snowshoeing, or winter training, this base layer provides the warmth, comfort, and technical performance needed to stay focused on every adventure.

• Shop All Smartwool
• Shop All Base Layer Tops