NIKE Mens 9" Phenom 2-in-1 Lined Running Shorts, Daring Red, Medium, 619890 647 86% Polyester/14% Nylon This lightweight and breathable running short is designed with a built in compression liner. Zipper pocket on back to hold keys, ipod, etc. Style: Phenom 2 in 1 Short - 9" inseam Vented sides for added breathability Fabric: 86% Polyester/14% Spandex Nike's Dri-FIT technology wicks moisture away from the skin and quickly evaporates it to the surface. You're sure to stay cool and comfortable in this breathable running short.