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Spira footwear features the revolutionized WaveSpring™ technology that delivers an energy return with every step. These athletic shoes are built with a lightweight, compact WaveSpring in the heel and forefoot that reduces impact and can prevent injury. Testing done by Michigan State University in 2001 showed that the WaveSpring produces an 87% to 96% energy return, which minimizes recovery time and reduces stress on the body. This technology is so effective that Spira shoes are banned by the USATF (the United States’ governing body for Track and Field). These athletic shoes have other orthopedic features, such as breathability, mid-foot support, torsional stability, maximum shock absorption and removable insoles. Spira footwear allow wearers to engage in physical activities for longer periods of time because the unique WaveSpring design lets them recycle their own energy.
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