FIFA Quality8 Panel designHybrid constructionAnli Campus Vimini 1.00mm textured PU outerHigh rebound 2mm EVA plus polyester and 2.5mm EVA foam linings.HR polyester wound bladder with latex cementing.The Rotario has passed rigorous testing to FIFA Quality standard for:Circumference to check to ball is the perfect sizeSphericity to check the ball is perfectly roundRebound properties at different temperatures so the ball remains optimum in any environmentBall weight between tight parametersLoss of pressure so the ball loses very little air over a long period of timeWater absorption so the ball remains playable even in the wettest conditions