What is an important factor in the design of Aylmeri jesses?

The design of Aylmeri jesses is critically focused on their ability to prevent leg sores on birds of prey. Properly designed jesses must fit securely without causing friction or pressure points on the bird’s legs, which can lead to irritation or sores. Therefore, ensuring that jesses are made from appropriate materials and are designed to contour to the bird’s leg helps in maintaining the health and comfort of the bird.

While factors such as being colorful, lightweight, or adjustable might provide some benefits, the primary concern is the welfare of the bird. Prevention of leg sores directly impacts the bird's physical condition and its ability to hunt and fly effectively. Therefore, the health benefits and the comfort level that come from a well-designed jesse are paramount.