Feels sturdy and durable as well. One indicates it has a 3. The only complaint is that they did not come in half sizes, so if you are a half size I would recommend going one size smaller; you dont want these clogs loose on your feet. She is 95 and has pretty round feet. I can not describe how easy it was to set up. Shame on them. There is no yucky chemical or plastic smell at all which is nice. Installation was easy once I figured it out. That being said, it is not unpleasant. Its been thrown down on gravel roads some, but mostly in my garage or driveway at the end of runs.