Birkenstock Boston Soft Footbed Ladies Wine Purple Suede Arch Support Slip On Mules. The BIRKENSTOCK Boston clog is a veritable classic that can easily be worn all year round. With its additional foam layer, the soft footbed offers extra comfort and pampers feet - all day long. Standard Width Fitting - D Upper/Lining/Sole - Suede/Suede/EVA. Standard Width Fitting - D.Sorry, our items are NOT available for pick-up. No additional information at this time.