When high-intensity winter adventures demand peak performance, the Smartwool Intraknit Thermal Merino Base Layer 3/4 Bottom delivers game-changing comfort that moves with you. This innovative men's base layer harnesses Smartwool's revolutionary Intraknit™ technology to seamlessly integrate insulation, ventilation, and articulation into one performance-engineered garment. The Merino Sport yarn construction combines the natural temperature regulation and odor resistance of ZQ-certified merino wool with synthetic durability for faster dry times, while strategically placed mesh ventilation zones prevent overheating during intense output. Built with 3D-mapped design that follows your body's contours, these thermal bottoms provide a near-custom fit that maximizes mobility whether you're skinning up peaks, trail running in winter conditions, or tackling any high-energy outdoor pursuit that demands both warmth and breathability.
