Birkenstock Madrid Birkoflor Magic Galaxy Silver Unisex Size USL11/M9 EU42 Description: New with Box The BIRKENSTOCK Madrid model is a true classic. The upper of this trendy model is made of particularly skin-friendly and resistant Birko-Flor® synthetic material. An additional shimmering protective layer has been applied to this material, which not only gives the sandal elegance, but also makes it extremely non-abrasive and resistant.