Very light stretch fabric for absolutely unrestricted movement. The inner mesh lining helps wick away moisture and increases breathability. 4-Way Stretch technology allows for better movement in every direction. The material wicks away sweat and dries very quickly. The upgraded expandable center pocket on the back is waterproof to keep your phone safe. Elastic waistband with internal drawstring. Reflective details for running in low light. Leg length: 17.78 cm.