The versatile Lifa® Merino Midweight Crew Base Layer adapts to any type of cold weather. We combined a 100% Merino wool layer with our proven Lifa® Stay Warm Technology in a fitted 2-layer construction. Lifa® Merino Midweight Crew Base Layer delivers all the breathable warmth of Merino wool fibers, plus the unique moisture management properties of Lifa® fibers.