Thank you for viewing! These "Pile Knit Arch Support Socks" from MUJI are designed to address issues like rubbing and foot sweat when wearing sandals. They look like wristbands and are worn around the arch of the foot. They suppress foot odor and are incredibly comfortable thanks to the soft pile knit. They're the perfect item for those who don't want to cover their toes but experience sweaty feet and rubbing on the top of their feet! Why not give them a try? These are new and unused, so you can use them with confidence! Size: Length: Approximately 9cm Width: Approximately 8cm (when contracted) M Size Thank you for your consideration.