Special design knitted nylon strap is very flexible to conform to your friends' body. Special Ultrasonic Cutting and Welding of material eliminates distractive stitching and eliminates all sharp edges so your friend's thin skin will never be damaged. Precise engineering of belt and slide keep the belt from tightening up and squeezing your companion when he pulls on the leash while walking and flying. Connects to retractable cord leash and Flight Line for greater flying distance. 40 Minute Instructional DVD included with every Aviator Harness. The Aviator constitutes a new mindset necessary to provide safe and effective harness and leash restraint systems for birds.