A technical mid layer designed to insulate and breathe during cold, high-output days, the Descender Long Sleeve Zip features 240gm textured RealFleece™, which has a high-loft brushed back with heat-trapping channels to help regulate body temperature. Lighter-weight side panels feature corespun fabric for durability, softness and added breathability. Zippered chest and hand pockets stash small essentials, and flatlock stitching and offset seams provide total comfort. Superfine merino fibers are brushed to create icebreaker RealFleece™, a natural fleece that warms and breathes next to your skin. Inspired by nature, icebreaker harnesses the performance qualities of natural fibers to offer an alternative to clothing based on petrochemical synthetics.