Amazon.com: Jump99 Ultra Strength Plyometric Training Shoes 。Jump99 J99 Mens Training Shoes 11.5 Black Plyometric Strength High Top Sneakers. These specialized training shoes feature a unique platform design specifically engineered to increase vertical jump, speed, and explosive power by focusing weight on the forefoot. Excellent pre-owned condition. Shoes were store model. Barely worn. See photos for more details. No original box. Keywords: Plyometrics, Vertical Jump, Basketball Training, Athletic Performance, Strength Shoes, High Top, Fitness, Workout, Explosive Power, Calisthenics