Our LIFAA(R) Merino Midweight collection is perfect for any type of activity in cold weather. We combined a 100% Merino wool layer with our proven LIFAA(R) Stay Warm tech in a 2-layer construction on this A 1/2 zip. LIFAA(R) Merino Midweight Base Layer delivers all the breathable warmth of Merino wool fibers, plus the unique moisture management properties of LIFAA(R) fibers. LIFAA(R) MERINO 100% Merino wool exterior Flat lock seams for ideal comfort and durability 2-layer construction Non-itch fabric ZQ wool