Birkenstock Women’s Gizeh Birko-Flor Silver Flip Flop - Size 38 The Birkenstock® Gizeh - Birko-Flor™ & Birkibuc™ is perfect for warm days and evenings. Easy care Birko-Flor™ upper in a classic thong silhouette with an adjustable buckle for the perfect fit. Upper is made of acrylic and polyamide felt fibers with a leather-like texture on top and a soft fabric underneath against the skin. Contoured footbed with arch support Synthetic upper/leather and textile lining/synthetic sole Silver Gently worn