Abstract: A sandal is provided with an inside arch and ankle stabilizing flange which forms an integral part of a one-piece molded bottom without a separate inner sole. The flange is smoothly curved and extends upward along the arch side for a longitudinal length from a point adjacent the side of the ankle stabilizes the ankle joint by preventing it from rolling inward toward the walking surface thereby providing an unusually high degree of security for an open shoe. The footbed of the molded bottom conforms to the plantar surface of the normal foot while walking or at rest. Both the bottom footbed and the upper pattern including the inner longitudinal arch flange are designed to allow for the anatomical and functional differences between the inside and outside longitudinal arch areas of the normal foot, and act to discourage the tipping of the ankle toward the inside of the foot, resulting in pronation.