When the temperature drops and layers become essential, the Smartwool Classic Thermal Merino Base Layer delivers the natural performance you need for all-day comfort. Crafted from 100% merino wool, this men's thermal base layer combines superior moisture management, temperature regulation, and odor resistance in one incredibly versatile piece. The slim fit design hugs your body's contours without bulk, making it perfect for layering under your favorite mid-layers and shells during cold weather adventures. Flatlock seam construction and strategically offset seams minimize chafing during extended wear, while the quarter-zip design with 10-inch zipper gives you instant ventilation control when your activity level heats up. Whether you're skinning up a backcountry slope, ice fishing at dawn, or simply need reliable thermal protection for winter commutes, this merino wool base layer adapts to your body and your adventure.
