They work as advertised. They stretch over time, but they adapt to tighten them. I am attaching a picture of them. Purple is not used yet. black used for about 2 weeks. and gray was used for a month. As I said, that's not a problem, because it can be delayed, and it doesn't happen all at once, but gradually. They are very breathable and comfortable and I would definitely buy them again if I needed them too
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