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I've some Inov-8 trail shoes that feel good to run x-country except that after about 5k they start to rub at the top of both heels. The fabric there seems quite unyielding and uncushioned in that place. I've used them about ten times.
Any suggestions on how to stretch or otherwise modify the shoes? Or is there an alternative I should look at?
BTW I normally wear Saucony MC5s Motion Control with an orthotic sole but need something more suited to muddy x-country.