Advantage, you. With the addition of the responsive FLYTEFOAM Midsole Technology and TWISSTRUST SYSTEM, the Solution Speed FF boasts the lightest weight in the tennis shoe category, making it an aggressive competitor that's always up for a match. Heel-to-toe GEL Brand cushioning offers maximum comfort and shock absorption for those quick cross-court hustles while the FLEXION FIT Upper secures your foot without restricting movement. Weight: 12.19. Heel Height: 19.5mm. Forefoot Height: 9mm.