NIKE Men's 9-inch Distance Running Shorts 100% Polyester Machine Washable This lightweight and breathable running short is designed with a built in brief. Style: Distance Running Short - 9" inseam Vented sides and inseam gusset for added breathability Fabric: 100% Polyester 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.