Met Cradle - A high performance webbed upper which gives great breathability, whilst securing the metatarsal heads in natural position, firmly holding forefoot in place whilst maintaining their natural alignment. * 1 Arrow Shoc-Zone - Barefoot style running, enhanced. A 3mm Differential gives you the best of both worlds; A great barefoot experience with the essential minimal protection. * 3D Air Mesh Upper - Made from stretchy material that forms around your foot gifting excellent comfort with a snug fit. * Fusion Sole - Blended synthetic Lite Rubber and EVA foam, injection moulded to provide a midsole that is lightweight but protective. * Micro-Thin Rubber - Blended with the midsole to give this barefoot trainer great comfort and protection.