Stay warm and active in the versatile lightweight base layer Arc'teryx® Rho Merino Wool Bottom with the natural performance of Merino wool. Designed for multi-day treks and mid-output winter activities. Merino wool is known for soft comfort, natural temperature regulation, moisture management, and odour resistance. Merino fibres are wrapped around a nylon core for added durability. Wool is sourced from humanely raised, non-mulesed sheep. Low-profile waistband reduces bulk for comfort under layers. Strategic seam placement and Merrow and flatlock seam constructions reduce bulk, layer smoothly, and enhance comfort. Next-to-skin fit with ergonomic patterning for mobility, comfort, and easy layering.