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Ray Fredericksen, president of Sports Biomechanics, Inc. compares typical midsole materials found in many athletic shoes to running in sand.  While initially perceived as soft and comfortable, these shoes require the wearer to exert greater effort. Muscles must work harder, causing fatigue and increasing the risk of injury.
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Whereas most shoes feature a cushioning system, the new Spiras with WaveSpring™ technology feature a patented suspension system that not only offers unparalleled shock absorption but actually returns 87-96% of the potential energy back into your step. This is the highest energy return score for any midsole material ever tested*. Unlike traditional shoe midsoles made primarily of foams, rubber compounds, or polymers, WaveSpring™ technology is an actual spring that stores and disburses energy with every step The result is more comfort, more stamina, less aches and more fun.
*Sports Biomechanics, Inc., Michigan State University, May 2001 |
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