A unique 2-in-1 base layer half-zip with a with a warm-breathable 100% merino wool exterior and a 100% LIFA® wicking interior. 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 Helly Hansen - Women's Lifa Merino Midweight 1/2 Zip