As with most socks that are rated for 9- 12 1/2 shoe size they are a bit small on the top end. I have size 12 shoe size and find them comfortable, but I would prefer them larger. They shrunk just less than 1/2" in the wash which will likely be fine as long as that is it for shrinkage.
The socks are comfortable and well padded and if they don't get smaller, they will be good. The tops are holding their shape and feel good. I prefer the feel of cotton and they are 80% cotton.