Birkenstock Siena Big Buckle Oiled LeatherThe Siena sandal gives you a new take on the classic two strap design, with crossover straps and an oversized, elegant pin buckle. Oiled leather gives you a perfectly lived in look, designed to age beautifully with wear. This Semi Exquisite style features a contoured footbed wrapped in luxuriously smooth leather for a premium touch you'll feel as soon as you step in. Contoured cork latex footbed creates custom support with wear Oiled leather upper,