NIKE Sidewinder Epic Lux Women's Tight Body: Dri-FIT 77% nylon/23% spandex. Mesh: Dri-FIT 81% nylon/19% spandex. Gusset lining: Dri-FIT 100% recycled polyester. Imported Dri-FIT fabric helps keep you dry and comfortable Wide elastic waistband with internal drawcord and slash pockets for a secure fit Flat seams feel smooth against your skin as you run Reflective elements enhance visibility in low light Zip back pocket is water-resistant to help protect small items