An exceptionally lightweight, 2-in-1 base layer with a warm-breathable merino wool exterior and a LIFA® wicking interior. Our LIFA® Merino Lightweight collection is versatile and ideal for all cold weather activities. We used our proven 2-in-1 layer system, combining LIFA® Stay Warm moisture management and the natural warmth of merino in an extremely lightweight half-zip. LIFA® Merino LIGHTWEIGHT delivers all the great benefits of merino wool fibers plus the unique wicking properties of technical LIFA® fibers. FEATURES 2-Layer Construction Fiber content: 70% Merino Wool, 30% Polypropylene