Medium-weight fabric with a unique grid pattern that traps heat but still breathes while training or running. 4-Way Stretch technology allows for better movement in every direction. The material wicks away sweat and dries very quickly. Smooth ColdGear fabric at the waist for added warmth and comfort with an external drawstring. Secure zip pockets on the hands. Reflective details for better visibility during training in poor light. Odor control technology minimizes odor.