The Arc'teryx Ionia merino wool long sleeve shirt transforms your mountain adventures with its ingenious hybrid construction that wraps ultra-fine 16.5 micron merino fibers around a durable nylon core. This technical base layer excels on demanding hikes, trail runs, and multi-day treks where staying fresh and comfortable matters most. The naturally odor-resistant merino wool regulates your temperature whether you're climbing through morning frost or afternoon heat, while the articulated patterning and 2-way stretch move seamlessly with every stride and reach. At just 190g, this fitted crew neck delivers the perfect balance of merino's natural performance benefits with the durability needed for serious mountain pursuits, making it an essential piece for trail runners and hiking enthusiasts who refuse to compromise on comfort or ethics.
Features
Natural odor resistance and temperature regulation from merino wool
Enhanced durability with nylon core wrapped in merino fibers
Articulated patterning with 2-way stretch for unrestricted movement
Moisture-wicking and breathable construction
Streamlined fitted cut for active pursuits
Responsible Wool Standard certified for ethical sourcing
