Once you run with a UA Speedpocket, you'll wonder how you ever ran without it. It expands to hold even a plus-sized phone, keeps it secure, and won't let it bounce.. Super-light HeatGear® fabric delivers superior coverage without weighing you down. Expandable center-back waistband pocket is water-resistant & keeps your phone secure, with no bouncing. Material wicks sweat & dries really fast. 4-way stretch material moves better in every direction. Encased elastic waistband with internal drawcord. Wrapping ankle zips for easy on/off. Fitted: Streamlined fit that’s not too tight or too loose.