A640 Steel Toe Polyurethane in Color Black | BIRKENSTOCK US。Birkenstock Professional A 640 work clogs feature a durable polyurethane upper and a slip-resistant PU outsole, designed for demanding kitchen and medical environments. These closed-back clogs include a replaceable anatomically shaped cork-latex footbed with a leather lining for all-day comfort and support. A certified steel toe cap provides essential protection, while the washable construction ensures easy maintenance and hygiene. The solid black finish and robust build offer a professional look with reliable performance.