Birkenstock's Kairo sandals feature an adjustable ankle strap. The cork insole is blended with EVA to be lightweight and flexible. This stylish model is a bridge between the sandal Birkenstock Gizeh and sandal Birkenstock Rio. HAVE A NICE WALK! Anatomically shaped cork-latex footbed Upper: Oiled Leather (natural leather can lead to different colors) Lining: suede Sole: EVA If additional pictures measurements or any questions I can answer please don’t hesitate to ask. Please ask all questions prior to purchase. Worn inside once, please see slight marks on insole…also dark spot on insole was there when purchased. Will not come in original box.