From their website: The original BIRKENSTOCK Sandal. A strap, a buckle, and a contoured cork footbed are masterfully combined to create the Madrid. An iconic slide with an amplified buckle accent. The semi-exquisite footbed is fully lined with soft piumato leather, making it exceptionally comfortable. The upper is made from high-quality natural leather with a high shine finish. Anatomically shaped cork-latex footbed; semi-exquisite Upper: natural leather with a high shine finish Footbed lining: piumato leather Sole: EVA Details: strap with a large, individually adjustable metal pin buckle; color-coordinated. Made in Germany