This antistatic polyurethane replacement footbed with a non-woven black sockliner complements the Birki-Air Antistatic. Important Tip: The Birki Air Antistatic shoe can only develop antistatic qualities when combined with the Birki Air footbed. This means that you should not replace the footbed with a traditional footbed. The Birki Air Antistatic footbed is washable and disinfectable at 60 ° C. Specifications: Material: PU (polyurethane) Insole: non-woven Details: washable at 60 ° C, disinfectable Replacement footbed