ADIDAS UCL PRO VOID 2022-23 OMB. 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. Materials: 70% Polyurethane, 20% Recycled Polyester, 10% Viscose. Country of Origin : Imported.