Carefully pull out the factory insole from each shoe.
For shoes with fixed insoles skip to step 4.
After removing the factory insole, align it on the top of your MASS4D® orthotics. This will give you an idea of what sections need to be trimmed.
Use a marker to draw the outline of your factory insole on the MASS4D® insole. Focus only on trimming the length and shape of the toe end. (yellow area)