I’ve noticed that Blundstone’s boots have this problem. If used fairly regularly, they just last and last. but if left alone for a couple years the rubber/PU sole ends up crumbling off of the upper.
I went to a shoe repair shop, and was told that the nature of these soles they can’t repair them, even though the leather upper was still in mint condition. He said that, when stored, the oils in the sole end up leaching out, but with regular use the oils get redistributed in the rubber.
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