Birkenstock Arizona Essentials Sandals. The legendary two-strap design from Birkenstock - the Arizona. Modeled on the cork original, this sandal is made from ultra lightweight and highly flexible EVA. These sandals are shock absorbing, waterproof, and skin-friendly. Wear them at the beach, in the garden, or around the gym and after workouts. Anatomically shaped Birkenstock footbed made from EVA. Upper/lining/sole: one piece molded EVA. Two straps, each with an individually adjustable pin buckle. Waterproof. Washable. Imported.