Birkenstock uses some abbreviations or symbols.
Discover the details here.
BS = Soft Footbed:
This features an extra soft footbed with an additional foam layer between the cork and suede. Birkenstock offers two footbed widths. This offers a streamlined aesthetic while maintaining comfort.
Their logo indicates which widths they are:
-Regular Fit (normal footbed): You'll see an unpadded foot logo on the insole and box.
-Narrow Fit (narrow footbed): You'll see a padded foot logo on the insole and box.
