Medial Arch Fill
Medial Arch Fill represents a percentage based change to the height of the orthosis (max +- 50%).
A positive percentage raises the height of the Medial Longitudinal Arch (MLA) region, a negative percentage lowers the height of the MLA region.
Area of Application:

For example, if the medial arch height is measured at 30mm then a value of 10% will result in a total height of ~33mm.
If the medial arch height is measured at 30mm then a value of -10% will result in a total height of ~27mm.
Lateral Arch Fill
Lateral Arch Fill represents a percentage based adjustment to the height of the orthosis within the area of application (max +- 50%).

A positive percentage represents an increase in the height of the orthosis in the area of application. For example, if the lateral arch height is measured at 10mm then a value of 10% will result in a total height of ~11mm.
A negative percentage represents a decrease in the height of the orthosis in the area of application. If the lateral arch height is measured at 10mm then a value of -10% will result in a total height of ~9mm.