NIKE Dri-Fit Tech Running Tights - X Large - Black DRI-FIT - Fabric technology which wicks away moisture and sweat effectively, keeping you comfortable and dry throughout your exercise Mesh Vents - Behind the knees for superb comfort in a high-heat area. Zip Pocket - Bonded back pocket used for small essential items such as keys, coins or a small media device. Ergonomic Fit - The compression style fit of the tights allows the shape to map to your body and reduce irritation and improve your movement. Reflective Strips - Enhances your visibility in low light conditions.