This fleece top is made with Polartec® Power Grid™ for lightweight flexibility and warmth at the crag and on the trails. The heat-regulating fabric uses a patented grid construction for excellent moisture management. That means you stay dry and comfortable, whether climbing an intense pitch or belaying your buddy. Lightweight, contrasting details create a two-toned look while remaining breathable. Plus, with a jacket over it, this top makes an ideal base layer for the coldest of conditions. The Run Fly Maglia Top for men is built for optimum warmth, comfort and stretch on cold climbs and trail runs.