The MBT Kisumu 3S is the new and improved version of the classic sporty men's sandal. The unique multi-layered sole and Masai sensor emulates the feeling of walking on sand. MBT Kisumu 3S Black Leather Men's Sandal 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 If you have any questions you can find the answers in our MBT Shoes Frequently Asked Questions section. Wearing MBT Shoes for the first time? Watch the MBT Shoes Instructional Video The MBT Index simplifies the process of finding the right level of MBT shoe for your needs. It ranks MBT into one of three categories, starting at Activate, our least level of rock, and progressing through Dynamic and ending with our highest level of rock, Performance.