The socks are announced for a size between 19 and 22. My son is 20, and swim in it completely. and because they cling to the ground (which is the goal), loses his socks. It is most dangerous to use them all, as it is eighth notes feet.
For a product at this price, it's really unusual, especially as Premium delivery is charged visibly more! 4.5 euros without premium delivery. 8.20 euros for premium delivery. (And it is the same vendor!)