Here's another 5 pack of boy's-sizes ankle socks.
Why it keeps doing 5 packs is a mystery, same with the answer to why they only do these in super little kiddie sizes only. (It's too bad) because the sock designs are pretty fun. You get 1 pair dedicated to Sonic, Tails & Knuckles with their name on each. The other 2 pairs are either white or black, with a group of rings only. Notice that the designs are woven into the socks themselves, so they can't ever wear off/go bad. This is 20 dollars in the Sega Shop setting them a little under 5 dollars per pair. This is a 2018 item.

Still socks! Sets of socks! Sonic socks....
Fall 2019 brings yet more Sonic socks. This time it is a set of "Kids No-Show" socks. There are 5 in the set, and the cut is made to be below even an ankle-sock. It is to hide that you have socks on at all. (But what is the point of that?) The designs are nice, as they are woven directly into the fabric, they won't wear off. The theme here is modern, with the character name along the bottom of each sock & the portrait on top.
You get arms-cross Sonic on a black/gray, a white sock with rings, fist up Knuckles on a gray/red, a black sock with rings, and standing Tails on a gray/yellow.
It's possible that these are a Walmart set, but they are child sizes only. They may also appear on Amazon. However, they should always be reasonably priced at about 9 or 10 for the set.