Crafted from Merino wool, known for its ability to regulate temperature and resist odour, Arc'teryx Ionia Merino Wool SS - Men's offers unparalleled performance. The lightweight and breathable fabric is responsibly sourced, while the fine-gauge fibres are wrapped around a nylon core for increased durability. Its streamlined fit and articulated patterning make it perfect for any outdoor activity from hikes to runs to tours to treks.