I bought these to wear with my Vibram FiveFingers, primarily for running, and so far, love them. They're very durable, even with the thinner fabric, and don't create hot spots when running or after wearing for longer periods of time. Even in warmer weather on runs longer than a few miles, they've performed very well.

Only downside I've discovered is that the "tongue" in the back doesn't quite go high enough to entirely block the leather back of the shoes, but it hasn't been a huge issue so far, since it hasn't created any chafing issues. I tend to just notice it when I'm sitting and flexing my feet against the back of the shoe.

Great socks. I would recommend them, especially for those who need durable socks for sports-related activities.