I made the mistake and got them too big. It's my fault, so I'll pass.
As a feeling, they are very good!
I don't like this elevated part on the heel because it's a bit loose and looks like an overflowing sock.
But it may also be due to the size.

One of the best socks I have ever bought. They are really high quality and fit the foot perfectly.

They are tight socks, snug-fitting and very good for running, as they don't sweat much and don't slip off the foot.

Daily use, 10,000 steps/day, 2 pairs alternating every other day. So far (2 weeks), the socks have shown no wear and tear on the material and fit, nor any discoloration from frequent washing. I will update in one month

The first experience is good. They have the support they claim, but they are so thin that they are not visible. I use them for everyday use with athletic shoes. The feeling is very good, like wearing no socks. I recommend them for 1.4 per pair. I will see, in 1 month, how they hold up after washing, which should be done by hand at 30 degrees. No washing machine, iron, or dryer. I will come back.