The Wilson(R) OPTX AVP(R) Replica Outdoor Volleyball is designed to allow athletes to track the ball and detect spin during a game. This outdoor volleyball is engineered with Optic Flow graphics which improve ball tracking in a variety of environments. The Superior Spin Detection VST(TM) uses strategically placed color variance which allows athletes to read and react to spin. Take your beach game to the next level. Details Optic Flow graphics allow for enhanced ball tracking VST(TM) uses color variance for superior spin detection Synthetic leather cover increases durability 18-panel design retains optimal shape Outdoor use