Hayabusa Weld3 Fight Shorts SLIM FITTING. These shorts fit tighter then the average fight short. Ultrasonic Weld3 Technology delivers indestructible strength and zero abrasion. First and only welded fight short developed by Hayabusa. Patent-Pending revolutionary design. Flat-Welded seams and sleek hem finish for maximum comfort. Silicon non-slip waist ensures shorts shirts stay securely in place.