They work as advertised with two problems: As with other reviewers I found they didn't stay in place very long, around a week if only placed once. However, if you lift and move it multiple times, it quickly loses its ability to stay in place. But they lasted long enough to try them out and confirm where I wanted them. I then marked their position on the insole and taped it with GOOP and now they stay in place. Another issue that others and I have noticed is that they are made of relatively soft rubber which makes them stick to my sock. when I try to glide over them. Not a big deal, just something you can control when you put your shoes on. Other than that, they seem to hold up and get the job done.
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