Birkenstock Arizona Birko-Flor Regular sandal in dark brown. The Arizona model is a true classic that has been delighting both men and women for decades. The simple sandal with two straps stands for timeless design and has long since become a cult shoe. The upper material is made of Birko-Flor, a skin-friendly and resistant synthetic material. Anatomically shaped cork and latex base. Two straps, each with an individually adjustable metal pin buckle.