Up until 1989, cushion, support and guidance were all combined into one shoe. When Torsion was born, adidas had developed different shoes designed specifically for different needs - like the ZX7000G for guidance, ZX8000C for cushion, and ZX9000S for support. These pioneering running shoes were the first of their kind on the market, the first biochemical shoes with Torsion technology that worked with the natural independent motion of the heel and the forefoot to create greater stability and control."
To add to this revolutionary design was the Torsion bar embedded into the centre of the midsole. This key feature changed running shoes forever, it prevented excessive unnatural twisting and ensured flexibility at the ball of the foot. Prior to Torsion technology, conventional running shoes restricted energy transfer with the rigidity of the soles. When running on uneven surfaces, the feet were forced into an unnatural position resulting in higher loads to the locomotive apparatus and unfavourable loading conditions."