A midweight base layer top ideal for cold-weather layering and active adventures, the 200 Zone Long Sleeve Half Zip is breathable, durable, and odor-resistant. The Zone combines odor-resistant corespun merino fabric with strategically placed merino mesh panels to help regulate temperature during stop-and-go days on the trail or in the mountains. A half-zip design makes for easy on/off and quick temperature regulation. Raglan sleeves and underarm gussets allow for unrestricted range of motion, and flatlock stitching eliminates chafing. Inspired by nature, icebreaker harnesses the performance qualities of natural fibers to offer an alternative to clothing based on petrochemical synthetics. Merino is an annually renewable fiber that naturally resists odors, keeps you cool when it's hot and warm when it's not, and lets your skin breathe for comfort all day, every day.