j1 insoles provide true support - not just cushion - for your flat feet and are clinically proven. j1 insoles come in two styles; one for Flat Feet and the other for High and Average Arches. J1 insoles were developed by Dr. Lorri Riley, who has been a podiatrist for over 20 years. J1 insoles are made of a medical grade plastic shell such as the plastic used for prescription orthotics. j1 insoles are semi-rigid to allow some flexion of the foot, but not just cushion, to provide the support your foot needs. j1 Slims are medical grade shell only to allow you to get the support in those tight fitting shoes - most people place the j1 Slims under the shoes' insole. j1 insoles come in 8 adult and 7 childrens sizes to allow the arch the proper support. The sizes are intended for the shell to go to the metatarsal head to allow maximum support. j1 insoles are made in USA.
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