NIKE Lab Essentials Pro Men&#39;s Three-Quarter Training Tights, Dust/Black (Large) Front and overlay: 78% polyester/22% spandex. Back: 80% nylon/20% spandex. Crotch and crotch lining: 77% polyester/23% spandex. An allover compressive fit supports your muscles during training An engineered jacquard waistband helps keep the tights in place while you stretch, cut, jump and run Reflective graphics on the calves provide visibility during early morning or evening outdoor workouts Bonded side seams and flat seams feel smooth against your skin Dri-FIT fabric helps keeps you dry and comfortable