What is a raised step section on a mat?
Hard-wearing all-weather floor mats, with raised step section to protect your shoes

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I don't know; it sounds like something particular to the product. I don't think this is a "knowing English" kind of thing. I think it's a "knowing stuff about floor mats" kind of thing.

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What would it protect the shoes from?  Often the raised edge of something is called the lip. But I'm not sure.