Arc'teryx designed the women's Satoro AR Zip Neck LS as a midweight base layer for prolonged use in cool-to-cold conditions. This technical long sleeve uses the technology of Nucliex™ STR 180 Merino wool, which is a yarn created by wrapping merino fibres around nylon filament. The result is a garment that has the comfort, warmth, and odour resistance of merino with the durability of nylon. Merrow stitching minimizes chafing during high-intensity activities. Elastane helps this base layer maintain shape even when its wet. This tops also has a next-to-skin fit, which aids with thermal retention, helping it wick away moisture. The deep V-neck unzips for rapid ventilation, while the tall collar adds warmth and a touch of style.