Heading out in very cold weather? Wear this thermal shirt to stay comfortably warm during low-intensity exercise. 6-oz. mid-weight 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. Sleek feminine fit follows and flatters your curves. Tag free for added comfort, with stretchy ribbed cuffs and non-chafe flat-locked seams. Great on its own or as base-layer thermal underwear.