Designed to be lightweight and flexible, the 2XU Aero 5" Shorts keeps you dry and cool so you can concentrate on your run.LIGHTWEIGHT & FLEXIBLELightweight stretch woven fabric is flexible and moisture-wicking for ultimate comfort.ESSENTIAL STORAGEA back zip pocket lets you safely store phone, cards or keys.REFLECTIVE TRIMSReflective logos and trims on front and back hem. FABRIC COMPOSITION: Main: 100% POLYESTER. Waistband: 72% NYLON, 28% LYCRA. Liner: 88% POLYESTER, 12% SPANDEX