Black and red Zokke sock. New.

Black and red sock from Zokke. Brand new, was bought in Japan as a gift, but never used. Tags still on. Square pattern in see through and red yarn to show ankle. Cuff and lower sock is black. Feels like black portion is cotton. But not 100% sure. Toe to heel:7 1/2”. Heel to top of sock: 5 1/2”. Red/clear portion: 2 1/4”.