Up until 1989, critical requirements such as cushion,
support and guidance were all combined into one shoe. With
the TORSION® era came different shoes designed
specifically for different types of running styles and runners:
the ZX 7000 for guidance, the ZX 8000 for cushion and the ZX
9000 for support.
As the first biomechanical shoe, the ZX 8000’s unique
TORSION® technology worked with the foot’s natural ability
to have an independent motion of the heel and the forefoot
to better adapt to the ground and create greater stability
and control. Runners appreciated the fact they had more
flexibility and comfort.