Orthopedic negative heel shoes have three versions of K P C. How many millimeters are they negative respectively?

Orthopedic rehabilitation of negative heel shoes is one of the three patented inventions in Beijing. This is a technique to correct posture from an angle. The millimeters of various models are confidential and will definitely not be leaked. There is a positive test online, with a millimeter count, and a book about 20 mm thick with bare feet on the ground. Because it is an experiment to imitate wearing their heel shoes, this is public. You should do the test first, and then buy orthopedic shoes after the test. KPC's three models are negative heel shoes, and the posture can be adjusted by shifting the center of gravity backward. In use, the posture is generally K-shaped. Generally, it is low back pain, P-type flat feet and C-type body shaping. If it is refined, such as low back pain and flat feet, I don't know where to choose. Please find the right book to ask! (check the information now, hope to adopt it! )