They massage the feet well and only need to be worn for a short time, from 30 minutes to an hour. You can pause and come back to it a second time, like I did, and they're useful. I only wish the front stones were taller because they only seem to cover about three quarters of my feet well. If I was young enough to stand on my toes I would be fine. I'm in my 60s and can only stand on my feet.
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