"What Our Gearhead® Experts Are Saying:""It's a classic, but we made it better. The seaming is comfortable and sporty, and—of course—merino wool is the best.""We built our Backcountry Cedars RWS Merino Midweight Crew Baselayer Top for cold-weather play. The Responsible Wool Standard-certified merino wool fibers are sourced from animal- and earth-friendly farms, and they deliver the anti-odor, temperature-regulating technology we love. With recycled nylon enhancing durability and spandex for stretch, this midweight material is sure to provide active comfort for winter hikes, skintrack ascents, and terrain park laps."