The Men’s SATORO AR Zip Neck Shirt LS from Arc’teryx is a midweight Merino baselayer that delivers wool performance with enhanced durability. Designed for prolonged backcountry use, this baselayer leverages the advanced fabric technology of Nucliex STR 180 wool. Each yarn is created by wrapping Merino fibres around a nylon filament to combine the natural comfort, efficiency and odour resistance of wool with the strength and durability of the nylon core. Elastane fibres maintain the next-to-skin fit. The tall collar adds warmth, and a deep V-neck unzips for rapid ventilation.