The Smartwool Men's Classic Thermal Merino Base Layer 3/4 Bottoms are midweight thermal base layer bottoms designed to provide warmth without extra bulk inside ski boots, hiking boots, or running shoes. Crafted from 100% responsibly sourced Merino wool, they naturally regulate body temperature, manage moisture, and resist odors to keep him comfortable through cold weather adventures. The updated slim fit follows the body's contours while reducing excess fabric and sag for a streamlined layering experience. Soft interlock knit construction and flatlock seams help eliminate chafing, allowing unrestricted comfort during long days on the slopes or trail. Finished with a Merino-lined elastic waistband and a functional fly, these 3/4 bottoms deliver dependable warmth and performance whenever winter conditions call.