The Birkenstock Men’s Arizona Birko-Flor Nubuck Sandals have a durable, synthetic upper with a nubuck leather-like texture and soft backing. The contoured cork footbed conforms to the shape of your foot and provides longitudinal and transverse arch supports. The Birko-Flor upper is made of durable synthetic material and offers a soft footbed lining for all-day comfort. The EVA sole is light and flexible, providing cushioning and shock absorption.