The SOLUTION SPEED FF™ 2 tennis shoe is designed for speed. It offers unparalleled flexibility for more energetic play on the court. Our lightest model yet, it's the best choice for versatile players looking for a fast, flexible shoe. The updated TWISTRUSS™ technology provides the flexibility you need to move freely, while being lightweight so it won't slow you down. We've added a new two-piece outsole for a lighter, more flexible feel, and we've included our lightweight FLYTEFOAM™ technology to support fast footwork. What makes the SOLUTION SPEED FF™ 2 more flexible and help you move faster? TWISTRUSS™ technology provides flexibility so you can move faster to cover more ground on the court. The new two-piece SPEED SOLE™ outsole is lightweight and flexible, helping you move with ease. FLYTEFOAM™ technology in the midsole makes the shoe lightweight and allows for quick and easy movement. What else makes the SOLUTION SPEED FF™ 2 stand out? This shoe is designed for flexibility and speed. We spent many hours testing and perfecting it at our Institute of Sports Science (ISS) in Japan. The SOLUTION SPEED FF™ 2 tennis shoe has additional features that support players during the game.