When walking, each sole has three fulcrum points to support the weight, if you put in the height of the height of the insole, it will cause the heel of the focus point to move forward, most of the weight of the whole body is concentrated on the soles and the center of the feet, it will cause pain .The flat heel structure of the increased insole is moderately raised in the shoe, and supplemented by curves and elastic forms, so it is safe and comfortable to wear.