Years of research has determined that our Parrots will be healthier, more active and more confident when flighted. The harness has an elastic restraint so as not to do any harm when they reach the limits of the harness. The extra large harness fits Parrots from 1000 - 1600 grams such as Large Moluccan, Green Winged Macaw, Hyacinth. The one piece design makes it easy to put on and it comes with full instructions on a DVD. Add a Flight Line that is a tangle proof system allowing up to 250 feet of flight area (50' x 80'). The Flight Line comes with 2 lines, one lightweight for smaller Parrots and the other heavier for larger Parrots. Also check out this great video from Good Bird, Inc. that offers some helpful tips on harness training your Parrot. Blue.