Birkenstock Arizona Big Buckle Birko-Flor Sandals. The BIRKENSTOCK Arizona is a genuine classic that has been delighting both men and women with its timeless design for decades. The Big Buckle version features a large, elegant pin buckle – a fantastic, striking eye-catcher on this otherwise understated sandal. The upper is made from the skin-friendly, hard-wearing synthetic material Birko-Flor®. Anatomically shaped cork-latex footbed. Suede footbed lining. EVA sole. Two straps, each with an individually adjustable metal pin buckle. Imported.