LIFA MERINO LIGHTWEIGHT CREWA unique, lightweight, 2-in-1 base layer with 100% merino wool exterior and 100% LIFA® Stay Warm Technology interiorLIFA® MERINO LIGHTWEIGHT is perfect for any type of activity in cold weather. A unique 2-in-1 base layer with 100% merino wool combined with LIFA® Stay Warm Technology in a extremely lightweight 2 layer construction. LIFA® Merino LIGHTWEIGHT delivers all the great benefits of merino wool fibers plus the unique properties of technical LIFA® fibers.Fiber Content: 70% Merino Wool, 30% Polypropylene