The versatile LIFA Merino crew adapts to any type of cold weather. Helly combined a 100% merino wool layer with proven LIFA Stay Warm Technology in a fitted 2-layer construction. LIFA Merino MIDWEIGHT delivers all the breathable warmth of merino wool fibers, plus the unique moisture management properties of LIFA fibers. 2-layer construction. 100% Merino wool exterior. Flat lock seams for ideal comfort and durability. Non-itch fabric. 57% merino wool / 43% polypropylene. Regular fit. Use wool detergent. Do not use fabric softener. Wash inside out. Do not wring. Machine wash in lukewarm water - 40°C very gentle cycle. Do not bleach. Do not tumble dry. Do not iron. Do not dry clean.