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.Collared neckline for added coverage and warmth.Odor control technology minimizes odor.