Warmest-weight 100% Merino wool delivers consistent insulation with natural moisture management, temperature regulation, and odor resistance, all built into a smooth interlock knit that stays comfortable during high-output days. Flatlock seams reduce friction, while a Merino-lined elastic waistband maintains soft, secure comfort under packs and shells.

Cut with a slim, body-hugging fit, the Smartwool Men’s Classic Thermal 250g Merino Baselayer Bottom layers cleanly without bunching or bulk. A fully functional fly adds everyday practicality, and the 30" inseam (size medium) keeps coverage dialed for winter skiing, running, and cold-weather hiking. Built to stay warm, dry, and comfortable from first chair to last lap.

Key Features

• Fabric & Construction: 100% Merino wool; interlock knit
• Fit: Slim; follows the contours of the body
• Seams: Flatlock seam construction to minimize chafing

Additional Features

• Comfort Features: Merino-lined elastic waistband
• Closures & Design: Fully functional fly
• Sizing Details: Size medium inseam: 30" (76 cm)

Information provided by manufacturer