A strap, a buckle and a contoured cork footbed are simply, but masterfully, combined to create the original Birkenstock sandal - the Madrid. This simple, iconic slide is still the purest expression of the minimalist tradition that guides Birkenstock design to this today. * Patent Madrid a durable, synthetic upper material with a shiny patent leather-like finish and soft backing * Contoured cork footbed conforms to the shape of your foot and features pronounced arch support, a deep heel cup, and roomy toe box; lined with suede * Lightweight EVA sole for cushioning and shock absorption * Avoid extreme heat * Heel shape: flat