The highly versatile Mad Rock M5 Climbing Shoe eats face climbs for breakfast, devours cracks for lunch, and gobbles up boulders for dinner. The M5 owes its versatility to Mad Rock's unique concave design that keeps your foot flat while crack climbing and curved when you're climbing overhanging routes and problems. An Arch Flex ensures a glove like fit without any pressure points, and the Tek Flex upper provides a customizable fit by forming to the shape of your foot. Science Friction 3. 0 rubber is Mad Rock's most durable rubber, and it still retains excellent friction. Mad Rock also equipped this shoe with a Power Upper for enhanced jamming and toe hooking, a 3D molded Torque Heel for superior traction while heel hooking, and a polycarbonate midsole that helps this shoe maintain its shape for many years.