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The patented concave sole shape enhances your ability to use your feet like a second set of hands. Syn Flex uppers provide a snug fit and next-to-skin comfort. Slip-on design with a single power strap makes for easy on and off. AES midsole is exceptionally soft in the center and stiffer on the edges to provide increased sensitivity without compromising edging performance. Arch Flex system utilizes elastic R2 rand rubber to lock your foot into place without the pain typically experienced in a high-performance shoe. Asymmetric last shape and an aggressive downturn make the Shark ideal for the steepest terrain and competition climbing. Science Friction 3.0 rubber is specially formulated to be sticky and durable. Molded Edge Heel provides an improved fit and heel-hooking performance. Vegan friendly. Soft/Medium Stiffness.