Support, stability, and optimal fit! The BIRKENSTOCK Boston impresses with its functionality. Its soft suede upper wraps around the foot like a second skin and gives it a natural look. Anatomical footbed in cork and latex. Upper: suede. Insole: suede. Outsole: EVA. Details: two adjustable metal pin buckles. "Germany". Upper material: Suede. Suede is a type of leather with a brushed, rough surface. It has a soft and velvety surface that feels pleasant against the skin. Moreover, it has a good moisture-absorbing capacity. Suede is naturally soft and flexible. Its stability is not the same as that of smooth leather and varies depending on the chosen hide. These are not defects in materials or production.