Peak performance starts at your base, and this crew is the perfect baselayer when cold conditions call for extra warmth and exceptional breathability. The foundation of its performance and next-to-skin comfort is our proprietary PeakWool™ fabric, a powerful blend of soft yet resilient TENCEL™, nylon and elastane fibers with the warmth and wicking of merino wool to deliver strength, comfort and range of motion for cold days on the mountain. Flatlock seams minimize friction and thumbholes enable easy layering.