Women's Birkenstock Boston Big Buckle Narrow - Sandcastle Nubuck Bigger buckle, bolder Boston. We expand our wildly popular Big Buckle collection to welcome our most iconic clog—the Boston. An oversized, gleaming buckle adds the perfect statement piece to the classically laid-back look. On a contoured footbed that'll feel uniquely yours wherever you wear it. DETAILS: Contoured cork-latex footbed creates custom support with wear Oiled leather upper, unique finish with every pair Smooth leather footbed lining Flexible EVA sole Adjustable strap with oversized metal pin buckle Made in Germany