A dark textured synthetic cupsole and padded tongue complete the design

The base is built on leather

It has an adjustable metal pin-buckle strap across the instep

A leather lining finishes the inside

and ribbed cuffs and hem

birkenstock boston sfb leve mocca 660463 Color_Gravel/Pure Silver A dark textured synthetic cupsoleThe Boston Soft Footbed is a closed toe suede clog in a deep Mocha colour with a backless, low profile shape. It has an adjustable metal pin buckle strap across the instep, a cork footbed with Birkenstocks Soft Footbed construction and an integrated latex foam cushion, and a flexible EVA sole. A suede footbed lining and made in Germany construction finish the classic Boston design.