The women's Motus Crew Neck LS is designed to keep you performing your best during trail runs and endurance hikes. It's made from lightweight Phasic FL fabric, which is an advanced polyester fabric that wicks moisture, dries quickly, and has an incredible next-to-skin feel. The Motus crew has also been patterned to meet the high-output demands of trail running. Its women's specific trim-fit provides exceptional mobility. Arc'teryx also designed it with a stretch that contours to your body while keeping its fibers close to your skin, maximizing moisture wicking.