Birkenstock Siena Big Buckle. Beautiful sandals from Birkenstock in gorgeous design. The sandal has a soft footbed and a durable birkofluor upper. Anatomically constructed footbed to support the foot naturally for a comfortable fit. The footbed is covered in suede to keep your feet dry. Two wide side satin effect straps that intersect with an elegant adjustable buckle so you can adjust the fit. Lovely sandals from Birkenstock you will love to wear!