For years athletic and comfort shoe engineers have been trying to create a buffer between the foot and the road. Spira®
engineers developed a solution, the Spira
Wavespring™ energy return system that works with the ground by sending expended energy back to the wearer. The technology can be found in both the heel and/or forefoot of the running and athletic walking shoe models for men and women, deflecting and dispersing impact forces. Propulsive energy is returned to the wearer, reducing foot stress and fatigue, and providing exception performance comfort.