With the original sandal, Berkemann has a real classic in its range, if not the forerunner of all of today's active shoes. Originally developed by Prof. Dr. W. Thomsen for Berkemann in the 1960s as a prophylactic instrument against foot deformities in children, the original sandal conquered the entire (adult) world within a few years. The principle of muscle training and muscle strengthening when wearing the original sandal has not changed to this day. Step by step, the leather replacement strap and the wooden sole work according to the lever principle and thus train the foot and calf muscles. The 5-phase footbed incorporated into the wooden sole supports the natural rolling motion of the foot, at the end of which is the toe grip function, which in turn activates muscle contraction in the foot and calf. The original sandal can therefore also be seen as the smallest fitness studio in the world - one that you can even take with you everywhere.