The Smartwool Men’s Classic Thermal Merino Base Layer Bottom is your go-to for all-day warmth and performance. Made with 100% responsibly sourced Merino wool, these slim-fit bottoms naturally regulate temperature, wick away moisture, and resist odors to keep you comfortable through skiing, running, or hiking. The redesigned fit reduces sag and excess fabric, while flatlock seams prevent chafing. A Merino-lined elastic waistband and functional fly add everyday comfort and convenience, making this your warmest, most reliable base layer.

Key Features

• 100% Merino wool for natural warmth, breathability, and odor resistance
• Slim fit designed to reduce bulk and enhance mobility
• Flatlock seam construction minimizes irritation
• Warmest-weight Merino fabric for cold-weather performance
• Fully functional fly and Merino-lined elastic waistband for comfort