CoolMax - a special four-channel Dacron polyester fiber that is waterproof, non-absorbent and very quickly wicks away body moisture from the skin to the upper layer of the material. CoolMax wicks away moisture faster than other fabrics by evaporation and regulates body temperature. CoolMax keeps the skin permanently dry and warm during active movement and maintains a continuous air layer on the body that is thermally stable in cold and warm environments. CoolMax is soft and smooth to the touch.