Very lightweight stretch fabric for absolutely unrestricted movement 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 An upgraded, expandable center pocket on the back is water-resistant to keep your phone safe Elastic waistband with internal drawcord Secure side pocket with zipper Reflective details for low-light running Leg span: 17.78 cm.