Combination leather and mesh uppers for the ultimate in breathable comfort. Easy slip-on entry is secured by a hook-and-loop strap. Exceptionally soft, moisture-conducting microfiber sock lining and split leather insole provide breathable wear. TPU and glass fiber shank adds firmness to sole construction and also ensures a natural rolling movement of the foot for even weight distribution. PU midsole with pivot is the balancing section underneath the metatarsus which requires an active rolling movement with every step. This activates a large number of stabilizing muscles throughout the whole body when walking or standing. Masai Sensor (Masai Barefoot Technology?) creates a pleasant feeling of walking on a sandy beach or soft moss. Instantly offers a natural instability to which the body automatically reacts increasing muscle activity. Secure rubber outsole offers lightweight support and durability.