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Edward Scharf

I have done that to Keens, deck boots and shoes. I usually have good luck with an orbital sander with 80 grit.

Dick Stevenson

Hi John, A wire brush accessory chucked in a drill works well also. Dick

Matthieu Chauvel

For those of us wearing Crocs, or shoes with soles made of foam resin Croc-like material that eventually wears smooth (and accordingly dangerous), I gave this soldering iron method a try a couple months ago, seems to work pretty well! https://www.instructables.com/Revive-your-Crocs-grip/