How much wider is a 4E?

Excuse me, could you please clarify what you mean by "a 4E"? Is it referring to a specific size measurement, a product code, or perhaps a technical term in a particular industry? Without further context, it's difficult to give an accurate answer as to how much wider it is compared to something else. Could you please elaborate on the context in which "a 4E" is being used? That would help me provide a more precise response to your question.