Our Lifa® Merino Midweight collection is perfect for any type of activity in cold weather. We combined a 100% Merino wool layer with our proven Lifa® Stay Warm tech in a 2-layer construction on this ½ zip. Lifa® Merino Midweight Base Layer delivers all the breathable warmth of Merino wool fibers, plus the unique moisture management properties of Lifa® fibers. Compare prices from: Helly Hansen in Woman's Sportswear