Birkenstock ESD sandals Boston, blue, normal width, 44 The Boston ESD offers an ideal combination of a classic look and reliable protection against electrostatic discharge. The ESD version thus protects people and materials in highly sensitive areas such as the semiconductor industry. Footbed: Anatomically moulded cork-latex footbed with additional soft bedding. Upper: Smooth leather. Insole: Suede leather. Sole: Cushioning EVA outsole in ESD design. Details: Individually adjustable metal pin buckle. Colour: Blue. Width: Normal. ESD protection tested in accordance with EN 61340 from 1.0 x 105 to 3.5 x 107 ohms.