The BIRKENSTOCK Madrid is the oldest member of the family of models, making it a true classic. Launched as a gymnastics sandal half a century ago, this simple, single-strap style has become a fashion favorite. The upper is made of skin-friendly and durable Birko-Flor® synthetic material. Anatomically shaped cork and latex footbed Upper: Birko-Flor® Insole lining: Suede Outsole: EVA Details: Single strap with individually adjustable metal buckle Made in Germany