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twice is the first mtb-shoe with a sole that can adapt to the differing conditions,based on a feasable technology concept.the most important element is the carbon sole which is flexible in the front part of the sole,and stiff in the back part.by simply stepping in the pedal the flexible part becomes stiff,optimizes power transmission while paddeling and this way the bikers performance.stepping out of the pedal releases stiffening,enables comfortable walking and furthermore reduces injuries.its reduced and functional design makes twice to a self-explanatory product.