We have experimented with a variety of seamless socks, especially for the young padawan and the problem with most of them is that they are knitted wool socks and very hot in the South African climate. These socks are much cooler and very comfortable. Even though they are thick, they do not heat up his feet that much and he is very happy with them!
The white socks can be used for both school and sport, as they are slightly cushioned. They are for a shoe size 12 to 4, but can fit a 5 as well.