The MBT Kisumu 3S is the new and imporved version of the classic sporty women's sandal. More streamlined version of the Kisumu, complete with leather upper and waterproof Masai sensor! The unique multi-layered sole and Masai sensor emulates the feeling of walking on sand. Full grain leather upper Soft microfiber lining allows moisture to wick and helps keep your feet cool and dry Midsole is made with TPU and nylon mixed with glass fibers for extra firmness and durability Multi-layered sole creates natural instability to emulate the feeling of walking on sand Adjustable ankle and metatarsal straps for a custom fit MBT has updated the new Spring 14 line by making the Masai Sensor in the sole waterproof so it will not break down when wet!