Birkenstock Cairo Marked Size: 41 This model features a thong design with an ankle strap. Compared to models like Gizeh and Ramses, it provides a more secure fit for the foot. I haven't worn these much, so there's hardly any wear and tear, and I think they're in good condition. However, please refrain from purchasing if you are overly concerned about minor details, as they have been stored at home by a private individual.