Leather upper for beautiful, long wear. Tiny air channels deep inside the sole connect the front of the shoe interior with the back to circulate air inside the shoe as you walk. Flexible midsoles in natural latex foam provide soft and supple walking comfort. Latex foam padding avoids pinching and rubbing just below the ankle. The MEPHISTO AIR-BAG system, placed in the base of the heel and under the metatarsal arch, protects your spine and joints from the jarring effects of walking.