NIKE Men's Dri FIT 9" Filament Compression Running Shorts, Gray, S, 519708 067 92% Polyester/8% Spandex Mesh lining at gusset for excellent breathability. Zipper pocket on back for secure small item storage. Style: Filament compression running tight short - 9" inseam Elastic waist with interior drawcord for a snug fit that stays put. Reflective elements for enhanced visibility in low light conditions Fabric: 92% Polyester/8% 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.