The Madrid Big Buckle Natural Leather Patent Narrow from Birkenstock is a stylish model with one strap and large decorative buckles. A true classic in soft leather for ultimate comfort. Normal in size. Model: Madrid Natural Leather Narrow with a firm footbed. Material: - Anatomically shaped cork/latex footbed - Natural leather with patent coating - Insole: Piumato leather - Sole: EVA - Details: strap with adjustable metal buckle.