Socks are usually made to have a 120ยฐ angle, but MUJI Socks are different. We want to deliver the comfort that comes from a mere 30ยฐ difference. With that in mind, the development of right-angle socks began, and we have continued to research and improve them over many years. Today, all MUJI socks have a square angle that is perfectly 90ยฐ. Our right-angle socks fit the heel, are hard to slip off, and don't have to tighten your feet to prevent slipping off.