The foundation of righteousness. Negative heel shoes are a significant technological advancement recognized by the state and have been incorporated into university textbooks and become part of medical textbooks. The only company that holds this patent is the Zhengzhiben brand, namely the Beijing Zhengzhiben Institute of Human Mechanics. As professional orthopedic rehabilitation shoes, negative heel shoes are serious scientific innovation products based on three national invention patents and multiple academic papers on human body mechanics research. They are by no means simple high in the front and low in the back.