I didn't know these soles are made of hard plastic with grippy rubber glued to the underside. The grip rubber doesn't feel very thick and I'm skeptical as to what they will be like once the rubber wears out. I bought them to wear to the gym and I hope they don't tear the treadmill. They are surprisingly comfortable due to the lack of cushions. I'm not sure how long I'll be wearing them before I swap them out.
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