Unfortunately, this effect is marred by the fact that the Y-heel does not contribute to a relief of the pressure feeling on the front transition between ankle and lower leg, but this, unfortunately, strengthened.
I keep them nevertheless, because of the cooling effect is really good.
It would be desirable to put the effect of Y-heel, like on the label of the sock is to actually know (my feet, etc. are standard; otherwise I have never had problems with socks of any kind).
For durability, I would say that the socks are apparently durable. I have the sock that I have already purchased 1 year ago, still, and it is still portable. For the price of 12EUR per pair and the least that one can expect.
Although I have bought or 4 pairs, but I think I'll wait for better adapted, with regard to. The above problem, before I buy more of it. If the problem was solved, there 5 stars from me!