Orthofeet Sydney Lace-Up Shoes Synthetic Highly breathable synthetic / mesh upper helps keep feet cool, while stretching for a customized fit. Cushioned arch offers added support and pronation control to help keep the foot from rolling inward too much. Triple-layer, removable insole cushions your steps, or it can be replaced with your own orthotic. Tapered toe with deep flex grooves allows forefoot flexibility for a more effortless stride. Material Content: synthetic / mesh upper, mesh upper lining, EVA insole and midsole, plastic shank, rubber outsole.