Product Details + Details New! Compression-molded toe box made with our Science Friction 3.0 rubber Patented Concave Sole Patented 3D expandable hooking heel for a versatile fit made with climbing grade rubber Arch Flex for support and a better fit Downturned and twisted profile for power and precision Low profile and pointy toe box Stretchy and breathable tongue Low Volume version offers a narrower toe box, smaller heel cup, and a lower profile Vegan friendly Technical Details Stiffness Medium Upper Material Syn Flex Closure Hook-and-Loop Rubber Science Friction 3.0 and Science Friction R2 Rand Midsole 1.8mm Polycarbonate Profile Aggressive Asymmetrical Curvature Significant UK Sizing Upsize 1 full size to find your US size