Spira illegal Spring Loaded Racing Shoes
These racing shoes--deemed illegal by the USA Track & Field for providing an unfair advantage to athletes--have two shock-absorbing springs in the forefoot that relieve the stress and fatigue of running better than any shoe available. The shoes' patented springs return up to 96% of the energy from each stride that would otherwise be lost to the ground.
The downward force deflected and dispersed during each impact is recycled to the wearer as propulsive energy, further reducing the strain on the feet and reducing overall recovery time. Unlike the gels used for cushioning on other athletic shoes, these springs will never break down or degrade.
Click here for more information...