I don't know if it's copper or not, but it's still very good socks. They were very comfortable and I wear them in my work boots with no problem although my boots are already broken in so maybe that's important. I liked them so much I bought my husband a second pack. He thought they were too tight but he has huge calves (he finds those baggy diabetic socks most comfortable) so he ended up giving them back to me. I also find the tops a bit tight, but I do that with almost every round sock I've ever owned. I simply fold the top back towards my ankle and then I have added protection from the top edges of my red wings. Anyway, I've had them for over a year now and they're holding up VERY well. At least three times longer than the basic, classic Crew versions, and I've been known to run 7-10 miles at work some days every day. I don't know how well the copper feature works, but the quality for the price, even for a basic sock, made it worth it so I definitely recommend it. The bottom line is that even if the copper sucks, you're still getting a quality sock, so it's still a worthwhile buy. I have a ladies eight and ordered L/XL.
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