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What if you could actually recycle the energy you use when you run? That’s the idea behind Spira’s WaveSpring midsole technology. Not only does WaveSpring reduce peak impact forces by about 20%, testing at Michigan State University showed this innovative midsole actually returns 87% – 96% of the energy used. That’s the highest energy return score for any midsole tested and an exciting boost for your performance.

Spira also boosts performance by offering shoes that are right for you even if your feet are especially wide, narrow or hard to fit.

And Spira’s WaveSpring midsole will outlast the shoe itself and give you that “new shoe” feel for as long as you wear the shoe.

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