NIKE Women's Dri Fit 4" Rival Running Short, Black Gray, Medium, 618130 010 88% Polyester/12% Spandex Quick drying running shorts. Dri-Fit material wicks away sweat, keeping you cool and dry Fabric composition: 88% Polyester/12% Spandex. Waistband Fabric: 86% Polyester/14% Spandex. Built in briefs with lined gusset increases support for secure coverage and comfort Ventilated hem ensures breathability for cool, dry performance Wide contrast waistband provides a secure fit. 4" inseam. Zipper pocket on back for keys, etc.