Birkenstock Madrid Patent Leather 41 N Birko-Flor Patent 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. Contoured cork footbed conforms to the shape of your foot and features pronounced arch support, a deep heel cup, and roomy toe box Adjustable strap 41 NARROW New with tags, no box.