Shoe heel spring

摘要: An athletic shoe device that fits through the wedge sole and insole a hole in heel area of sports shoe, which I named Roosevelt Spring. The spring is activated with weight an athlete, while walking or running, this done by absorbing shock giving energy sequence to athlete without losing balance stability, causes no pain foot. also supported strength spring. It increases lifetime sport shoes will help be responsible for decline related injuries, as well enable man go farther faster.