Single strap design promotes natural exercise: the most simple design in the Birkentock range is the one-strap model. Only the front piece of the shoes holds the foot in place, meaning each time you walk, the heel lifts from the footbed, with the feet extending to grip the ground. This movement engages the calf muscle to provide natural training to the feet and legs. Materials: Birko-Flor; Belt: adjustable; Sizing: standard sizing *Special order item
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