Heading out in very cold weather? Wear these men's thermal bottoms to stay comfortably warm during low-intensity exercise. 6.3-oz. fabric has two non-bulky layers. Outer layer contains Merino wool for natural insulation. Inner layer is pure cotton, for softness next to your skin. Together, both layers trap air to create a warm thermal barrier. Tag-free elastic waist wicks moisture for added comfort. Ankle length, with ribbed bottom cuffs and non-chafe flat-locked seams. Close-to-body fit. Convenient front fly.