Product descriptionHelly Hansen say - 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.Shell: 57% Merino Wool, 43% PolypropyleneLIFA® MERINO2-layer construction100% Merino wool exteriorFlat lock seams for ideal comfort and durabilityNon-itch fabricZQ wool Helly Hansen Lifa Merino Midweight Crew Concrete