The Men's Helly Hansen Lifa Merino Midweight Half Zip Baselayer is perfect for any type of activity in cold weather. With 57% Merino Wool and 43% Polypropylene, you get the ultimate benefits of Helly Hansen Lifa® technology to wick away moisture while the merino wool creates breathable warmth. This unique 2-in-1 base layer has a regular fit with flat lock seams in a non-itch comfortable lining. Very lightweight, extremely breathable, down insulated with heavy-duty durability, this base layer is a must have in your winter wardrobe.