Suede with shearling lining upper Shearling footbed EVA Sole Anatomically shaped cork-latex footbed Individually adjustable metal pin buckle The BIRKENSTOCK Boston clog is a veritable classic that can easily be worn all year round. Here, the classic model comes in a particularly cozy version with color-coordinated shearling lining and straps lined with shearling. The perfect shoe for cozy winter evenings by an open fire! The upper is made from soft suede.