Birkenstock Boston Big Buckle Clog in Sandcastle Material is leather, not suede. Size 39 / 8 Note some minor scratches and marks shown in photos. Overall in great condition. Oiled leather brings a unique patina to this iconic clog reimagined with an oversized buckle and fitted with a contoured cork footbed for signature comfort. • Contoured cork footbed with arch support • Leather upper and lining/synthetic sole • Made in Germany