Speedshell Panel Shape: Designed to increase the speed of flight and rotation of the ball to achieve excellent aerodynamics and a perfect shot. This meets a series of rigorous testing at a neutral facility that measures variables like weight, circumference, roundness, bounce, water absorption, etc. Thermally Bonded: Helps maintain the roundness of the ball to ensure consistent flight path and overall performance. Rubber Bladder: Delivers exceptional air retention. A must for any Man City fan. Be sure to check out my other CL and World Cup match balls.