Birkenstock Ibiza Birko-Flor Purple 2Buckle Sandals 38 - US 7/7.5 In Great Conditions. The Anatomically shaped cork-latex footbed Upper: Birko-Flor® is a skin-friendly, tear-resistant and easy-to-care-for synthetic material which is exclusively used by BIRKENSTOCK. Footbed lining: suede sandal is adjustable thanks to its two slender straps, offering good grip and perfect adjustment to different foot shapes. The upper is shown in skin-friendly, hard-wearing Birko-Flor®. Anatomically shaped cork-latex footbed Upper: Birko-Flor® Footbed lining: suede Bin 6686