The Mens Arcteryx Ionias performance is innate. Made from Merino wool a material known for temperature regulation and odor resistance its light, soft, breathable, and responsibly sourced. The construction wraps the wools fine-gauge fibers around a nylon core for added durability. The fit is streamlined and comfortable, and the articulated patterning moves with you on hikes, runs, tours, and treks. Crafted at a Fair Trade Certified facility as part of our commitment to transition 80% of Arcteryx products to fair trade certification by 2025.