The Backcountry Spruces Baselayer Crew features an innovative blend of wool and synthetics, ready for cold days full of snow-white adventure. The Nuyarn fabric wraps merino around a nylon core, offering next-to-skin comfort that's durable enough for active pursuits. The slim fit layers easily beneath your hardshell, where you benefit from all of wool's moisture-wicking, odor-eating wonders while you ski or hike.