You've seen the Sonic full-body-design socks now you can see...
Knuckles. The Sonic socks were successful enough that now they've added classic style Knuckles to the 'crew'. These red socks have all of forward-facing Knuckles as part of the weave (so it can't wear off) Like the previous pair, his shoe toes are the sock's toe, the legs/fists are the foot part & the face/chest area is the ankle and leg part. He is borderless mostly for his head to try and give the effect 'the character is the sock'. The background for where the legs are is gray. The over-all effect is kind of cartoony/wacky but they are classified as novelty type socks so that's probably fitting.
These are on Amazon but they may also be a Spencers Gifts item. They appear in fall winter 2020.