Give the mountain your worst while the Arc'teryx Women's Phase SL Boxer helps you feel your best. Engineered for optimal moisture management, this performance boxer is made from next generation Phasic SL fabric for a softer touch and improved stretch. Ideal for stop-and-go activity, this boxer wicks moisture during active phases and dries quickly when you're at rest to keep you more comfortable. An updated fit and flatlock construction provides next-to-skin comfort, while a gusseted crotch enhances mobility.