Warmest-weight 100% Merino wool sits next to skin with an interlock knit that balances warmth, moisture management, temperature regulation, and natural odor resistance. Flatlock seam construction reduces chafe during long days, while a Merino-lined elastic waistband adds soft, consistent comfort through movement and layering.

Built with a slim, body-contouring fit, the Smartwool Men’s Classic Thermal 250g Merino Baselayer Bottom moves cleanly under shells and midlayers. A fully functional fly adds everyday utility, and a 30" inseam (size medium) keeps coverage dialed. From cold chairlift laps to winter trail days, the Smartwool Classic Thermal 250g Merino Baselayer Bottom delivers reliable warmth without bulk.

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