Introducing the Boston Big Buckle Platform Fur Narrow from Birkenstock. Were loving the Birkenstock Boston, and were ready for fall with this cool variation featuring teddy shearling and a platform sole. True to size. Model: Boston Big Buckle Narrow with platform sole. Material: - Anatomically shaped cork and latex footbed with shearling - Upper: nubuck, oil - Lining: suede leather - Sole: EVA.