The ColdGear infrared lining uses a soft, thermally conductive inner layer that absorbs and retains body heat. Two-layer fabric with an extremely warm, brushed inner side and a smooth, quick-drying outer side. 4-Way Stretch technology allows for better movement in every direction. The material wicks away sweat and dries very quickly. Hood at the neck for added coverage and warmth. Built-in thumbholes help keep the sleeves in place and trap heat. Odor control technology minimizes odor.