Boston Big Buckle Nubuck Leather Sandcastle BIRKENSTOCK Boston Big Buckle Nubuck Leather Thyme BIRKENSTOCK Shop Women Boston Clogs Online BIRKENSTOCK Boston Big Buckle Nubuck Leather Sandcastle BIRKENSTOCK. Bigger buckle, bolder Boston. BIRKENSTOCK expands the wildly popular Big Buckle collection to welcome their most iconic clogthe 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. Contoured cork latex footbed creates custom support with wear Premium nubuck leather upper Suede footbed lining helps keep you comfortable EVA sole is flexible & lightweight Adjustable strap with oversized metal pin buckle Narrow Medium width