Birkenstock ESD sandals Boston, blue, normal width, 48 The Boston ESD offers an ideal combination of a classic look and reliable protection against electrostatic discharge. The ESD design protects people and materials in highly sensitive areas such as the semiconductor industry. Footbed: Anatomically moulded cork-latex footbed with additional soft padding. Upper: Smooth leather. Insole: Suede leather. Sole: Cushioning EVA outsole in ESD design. Details: Individually adjustable metal spiked buckle. Colour: Blue. Width: Normal: Normal. ESD protection tested according to EN 61340 from 1.0 x 10^5 to 3.5 x 10^7 Ohm.