Retryver 

What is anti-static shoes?
Antistatic footwear has an electrical resistance between 0.1 MegaOhm and 1000 MegaOhm. These safety shoes will not allow a build-up of static energy in your body and therefore avoid sparks that could ignite a fire or an explosion. Antistatic shoes are ideal in environments where solvents and fuels are used.
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The dielectric over boots provide the additional protection of insulation. This is in the event that the technician comes into contact with a live electric source. In such an event, the over boot could prevent electric shock. Being an over boot means that it's not necessary to remove existing safety footwear.