Our Solution Speed FF 2 tennis shoe, the quickest model in the ASICS lineup, is designed to assist players in covering more ground on the court. It is advised that players who want to be ahead of the ball through faster accelerations choose for this shoe since it combines improved stability with a more flexible fit. A PU (polyurethane) application on the upper of the Solution Speed FF 2 model contributes to increased fit, flexibility, and support.