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.