Our Lifa® Merino Midweight Pants keep you warm and dry during any type of cold weather activity, so you can get outside and stay outside longer. We combined a 100% merino wool layer with our proven Lifa® fiber technology in a 2-layer construction. Lifa® Merino Midweight. delivers all the breathable, natural warmth of merino, plus the unique moisture management properties of Lifa® fibers. These base layer pants come in cool prints and are fitted for optimal mobility without bulk.