MBT Men's Kimondo Athletic Shoes 100% Authentic Guaranteed! TPU and glass fiber shank adds firmness to sole construction and also ensures a natural rolling movement of the foot with every step, optimizing the pressure distribution over the whole sole. Masai Sensor (Masai Barefoot Technology) creates a pleasant feeling of walking on a sandy beach or soft moss, and instantly creates a natural instability to which the body automatically reacts, increasing muscle activity. MBT DRY&COOL sockliner allows for breathability, assists moisture management, is quick-drying and antimicrobial.