Not great
I tried to peel the back off of one and there was no sticky adhesive on the back of it. It just crumbled so I threw it away. The next two I had no problem with, they stick fine and do the job decently, but now I'm one short. I'm sure there's better out there. I don't think it's worth missing out on coverage for a whole pair of shoes due to the chance of one or two defective ones.
Rating: 2 stars