This document discusses various modifications that can be made to footwear to accommodate medical conditions and pathologies. It describes modifications that can be made to the inner sole, heel, toe box, and other parts of the shoe. Common modifications include metatarsal pads, inner arch supports, heel wedges, rocker bottom heels, and toe sliders. The modifications are intended to improve function, accommodate leg length discrepancies, arthritis, neurological conditions, and support medical issues like plantar fasciitis.