Our Backcountry Cedars Rws Merino Lightweight Crew Baselayer Top builds on the essential baselayer by boosting it with comfort features, materials, and a streamlined fit. Wool Standard-certified merino wool delivers all the anti-odor, temperature-regulating tech we love in a material that takes animal welfare into consideration. content increases -friendliness while enhancing durability, and stretchy spandex lets us fully utilize this articulated top's range of motion.