Product descriptionHELLY HANSEN say...We combined a 100% merino wool layer with our proven LIFA® Stay Warm Technology in a 2-layer construction. LIFA® Merino Midweight ¾ Pants delivers all the breathable warmth of merino wool fibers, plus the unique moisture management properties of LIFA® fibers. These base layer pants are fitted for optimal mobility without bulk. Helly Hansen Lifa Merino Midweight 3/4 Pant Black