Thermally efficient Phasic™ AR II fabric paired with Nucliex 150 – 87% Wool panels under the arms the Arc'teryx Rho Hybrid Men's Crew is built for active activities in cold weather where thermal comfort and wicking fibers work together to keep your core protected. Merino wool fibers and the DAO™ (Durable Odor Control) finish makes this an ideal piece for multiday trips… especially if you’re going to be in the company of others! A fitted cut for easy layering and a pattern tailoring for maximum mobility, all in a comfortable stretch fabric with a soft hand feel, this is an ideal baselayer for everything from backcountry multi-day treks to shoulder season training. Always built just that much better, this is an example of a baselayer with thoughtful design features to cover a range of cold weather sports and precise layering options.