Designed to be lightweight and flexible, the 2XU Aero 5"" Shorts keep you dry and cool so you can concentrate on your run. LIGHTWEIGHT & FLEXIBLE Wide, knit elastic waistband and lightweight stretch woven outer is flexible and moisture-wicking for ultimate comfort. ESSENTIAL STORAGE A back zip pocket lets you safely store phone, cards or keys. BE SEEN Reflective logos and trims on front and back hem provide 360 visibility in low-light conditions.