Product Description
Spira's patented WaveSpring technology may be the most significant advancement ever achieved in the footwear industry.WaveSpring returns energy with every step.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.Unlike traditional shoe midsoles made primarily of foams, rubber compounds, or polymers, technology stores and disburses energy with every step. Testing performed by an independent source reports that 87% - 96% of the energy is returned from the WaveSpring. This is the highest energy return score for any midsole material ever tested.

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