The Arc'teryx Rho Merino Wool Bottoms are versatile, lightweight base layer bottoms providing exceptional comfort and technical function for multi-day treks, winter activities, and year-round layering. 150gsm Merino wool delivers outstanding thermoregulation, natural odor resistance, and unmatched softness next to skin. A Nylon core enhances durability for extended adventures without sacrificing comfort. The next-to-skin fit maximizes moisture management and layering efficiency. Elastane fibers offer superior stretch and freedom of movement and ergonomic patterning and seam placement minimize chafing for all-day comfort. Responsible Wool Standard (RWS) certified ensures ethical sheep farming practices and environmental responsibility. The Biocidal-free odor control utilizes naturally occurring odor-resistant properties of Merino wool for multi day wear. Arc'teryx Rho Merino Wool Bottom Features 240gsm Mountain Merino Wool - 95% wool, 5% elastane Flatlock seam Articulated patterning Wool is sourced from humanely raised, non-mulesed sheep Fit:Next to skin Weight:200g Arcteryx Rho Merino Wool Bottom