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@kerley
The Berlins have the same sort of thing as the Marathon plus with the 'foamy' rubber bit under the tread rather than just having more rubber. So once the rubber is worn and the 'foamy' bit exposed I would assume they have had it.
A simple thick rubber approach can be seen on the Conti Travel contacts that I am using. The rubber must be 5mm thick which seems to be doing a very good job in making it difficult for any object to penetrate. They should also last for ages I would think.