|The BIRKENSTOCK Madrid, a classic model that was first launched as a "gymnastics sandal," has grown to become an essential fashion item. Fashion and functionality come together in perfect harmony on this elegant mule. BIRKENSTOCK has chosen the exceptionally skin-friendly and hard-wearing synthetic material Birko-Flor in a robust nubuck look. For 1/2 sizes, order next size up. N = Narrow Width.Size Chart: US=Euro7-7.5=40, 8-8.5=41, 9-9-.5=42, 10-10.5=43, 11-11.5=44, 12-12.5=45, 13-13.5=46, 14-14.5=47, 15-15.5=48