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Science and footwear are now one. Spira footwear has developed WaveSpring®, a remarkable energy return technology which stores and releases impact energy with every step reducing fatigue and the risk of injury while providing superior cushioning. Spira's WaveSpring® technology has the potential to revolutionize the footwear industry, and in the process, forever change the purpose and function of footwear. Unlike traditional coil or conical springs, the WaveSpring® technology is laterally stable, compact and lightweight and provides a cushioning system which reduces stress and fatigue by returning 87-96% of energy normally lost to the ground. Spira's shoes allow people to participate in physical activity for longer periods of time with far less stress on the body. Recovery time following vigorous activity is greatly reduced. Perhaps most exciting is the fact that Spira's new technology can be put into almost any type of footwear. While currently offering several styles of running and walking shoes for both men and women, Spira has plans to introduce a line of casual men's dress, basketball, and sandals in the near future. Spira's shoes are a must have for any runner interested in performance enhancement without compromising comfort and style.