Nike 7in Challenge Shorts feature an elasticated waist with a drawstring fastening as well as vented side panels for breathability. These athletic shorts include an elasticated waist, drawstring fastening, two slide pockets, vented panels, pant lining, and Dri-Fit technology with Nike branding. They are machine washable. Body: 100% polyester. Mesh: 100% polyester. Brief: 100% polyester.