Here's a bit of a strange pair of socks...
These are by Bio World, and are a part of their "Character" sock line. As you can see, they've also got Street Fighter Ken & Horror Movie Jason on their line along with classic Sonic. These are gimmick socks, they're knee-highs with the character either compressed (Ken) or stretched out (Sonic) to fit the long rectangle shape of the sock. Sonic is suffering from a bad case of 'big body' and the arms are shown kind of growing out of his chin a bit? Also, the legs seem like they are too far apart at where the hips would be, and go strait down....all this combines to make it a very strange pose, alsong with his hands just sort of...down and fists.
The packaging has a blurb about Sonic, how he's the star of his fast moving 1990s video games, and continues to be popular today, etc. (It's noting amazing, just some extremely standard information) This is a Spencers' Gifts item and is likely 12.99 for 1 pair of odd gimmick socks in 2019.

Is Bio World back on Sonic in 2018?
It seems so, because here comes a pair of simple socks. These are adults sizes Sonic themed socks. They have fairly large classic faces scattered all over. They're a normal length, & the designs are sewn in, so there's no graphics to rub off or wear out. They have a blue toe tip, heel & cuff. They are available at GameStop stores...but are they anywhere else?
You can see the BioWorld logo there on the classic type paper tag.

These are called the "Japanese Design 3 Pairs Sonic Socks"
These are a bundle on the Sega Shop in 2019, and should be about 13 dollars for the set. They are adult size socks. Each pair is black, with woven-in blue Sonic designs. The top pair has a classic Sonic face with his name spelled out in Japanese letters under it. The left pair has a blue toe & scattering of the same Sonic face. The right pair has a white toe, heel & stripes under the foot. That Sonic design is the 'side jumping' classic Sonic that was mostly seen in Japan. So, the set sort of lives up to the 'Japanese design' label.
Woven-in designs don't wear off/wear out easily, and adult sizes are always a good sign. 13 for 3 pairs isn't a super great nor super bad price. The sturdy & decent design plus ok price makes these an all right set to get.