How to Trim Your Insole
For full length covers, KLM's standard procedure for prescription foot orthotics is to cut the forefoot extension to the template of the shoe size provided on the prescription. If no shoe size is present, KLM cuts the insole covers to the cast, inferring the relative shoe size and erring on the covers being too long, as it is quite simple to trim them to fit a shoe perfectly. And as the old maxim goes... "measure twice, cut once".