When the mission takes you into inhospitable climates, the Arc'teryx LEAF Cold WX Zip Neck AR Wool Shirt can provide unbeatable warmth and resiliency so you can focus on getting the job done. This midweight base layer is made from natural merino wool that wicks moisture away from the skin and inhibits the growth of odor causing microbes. Nylon Core Spun Technology, reinforced seams, and gusseted underarms improve durability and wearability, making the Arc'teryx LEAF Cold WX Zip Neck AR Wool Shirt an essential component of your ECWCS gear.