Why do generic 3.5 mm Posture Control Insoles work for so many people?
The technology used in Posture Control Insoles is unique because it is not linear. The effect of the stimulus provided by a generic pair of insoles is not doubled by doubling the amount of stimulus. Generic Posture Control Insoles are optimized to give the maximum benefit to the largest group of people without giving too much. The next level only adds 2.5 millimeters (.1 inch).