Designed to help you regulate your core body temperature and prevent overcooling during intense physical activity in cold conditions. Our Ortles Hybrid TirolWool Responsive Vest is the ideal extra insulation layer for skimo, ski touring, alpine climbing, ice climbing and more. TirolWool Responsive is our proprietary lightweight, insulation material that combines innovative polyester fibers enhanced with thermo-reactive minerals and wool sourced from Tirolean sheep. Heat emitted by the body is absorbed and converted into infrared radiation, which is stored and reflected back to the body keeping you warmer for longer. TirolWool Responsive is water resistant, breathable and will still keep you warm when wet. Further features include: Durastretch inserts for ease of movement, high ergonomically-shaped front collar and front zip with full-length internal windproof flap.