Abstract: A user-customizable insole for insertion into foot wear in place of a conventional removable insole. The insole includes a cushioning upper insole and a semi-rigid yet resiliently flexible base insole used with insole adjustment devices. The upper insole is made of a resilient cushioning material such as foam. The base insole is made from relatively thin plastic with upwardly formed arch supports defining corresponding elevation curves between the base insole and a foot bed or inside bottom of the footwear to permit downward flexing of the arch supports. The arch supports are of a predetermined flexibility by controlling the material thickness and/or adding perforations therethrough. An upwardly formed perimeter wall extends around a heel portion forwardly along respective medial and lateral sides of the base insole tapering away at about a forefoot portion of the base insole defining a heel cup.