ClimaSense Thermoregulation Technology keeps you comfortable in all conditions - Engineered to adjust to your body temperature - Inhibits the growth of bacteria that causes odor - Fast wicking and dryingnHigh grid fleece for warmth and breathability in cold conditionsn4-way stretchnHeavyweight (3.0) perfect for cold weather activtiesnUPF Rating 50+nClimasense thermoregulation technology keeps you comfortable in all conditions. Engineered to adjust to your body temperature. Inhibits the growth of Bacteria that causes odor. Fast wicking and drying. High grid fleece for warmth and breathability in cold conditions. 4-Way stretch. Heavyweight (3.0) perfect for cold weather activities. Functional thumb holes, Pouch pockets and all flat seam construction. Up rating 50+. 95% micro-polyester, 5% spandex.