The golden Birkenstock Madrid is the oldest member of the family of models, making it a veritable classic. Launched as a gymnastics sandal half a century ago, this narrow single-strap model has gone on to become a firm fashion favorite. The upper is made from the skin-friendly, hard-wearing synthetic material Birko-Flor. It has anatomically shaped cork-latex footbed, suede footbed lining and EVA sole.