Birkenstock ESD sandals Milano, black, normal width, 41. The ESD sandals in black made from Birko pile with a particularly lightweight, antistatic EVA sole offer optimum support thanks to the two adjustable straps with sturdy metal buckles. The anatomically shaped Birkenstock cork-latex footbed with suede cover sole also promises optimum walking comfort. The heel strap, which is firmly attached to the shaft and also features a sturdy metal buckle, provides additional protection and good support. Heel straps are a requirement in many professional areas.