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This happened with a few of my mrs' pairs. What year are they from? There seemed to be a recent period where the plastic they were putting in as the heel cup was cutting back through the liner, and after not many wears. I cut through the liner, reshaped the heel cup plastic (made it lower) then cut some packing foam to fit where the hole was and taped over with gorilla tape. Not glamorous but did a job.
Thanks.
They're perfectly fine otherwise. I really want to keep them.