Adjustable Straps- Contoured Footbed- See Last Picture for Cracking Leather. These Birkenstock Betula Gizeh thong sandals are in size 38 for women (US 7, EU 38) and size 5 for men. They are brown in color with a leather upper. The sandals feature a buckle closure and have a leather outsole. The style is a classic thong sandal from the Birkenstock Gizeh product line.