A customizable therapeutic or occupational shoe sole and methods of producing the shoe sole are provided. The shoe sole includes an outsole, a midsole made from a shock absorptive material and an energy returner integrated with the midsole via an opening in the midsole. The energy returner includes a front lever arm secured to a front bottom recess of the midsole and includes a rear lever arm secured to a rear top recess of the midsole. The rear lever arm includes a lever arm joint for coupling the rear lever arm to the front lever arm. In some embodiments, shoe sole includes an adjustable base to enhance body mass control of the subject via a plantar flexor tendon, thereby customizing for unique biomechanics by relocating the adjustable base relative to the rear lever arm.