These are Okamot's Marude Kotatsu Socks, designed for sleeping. They use heat-generating material to warm two acupressure points: Sanyinjiao and Shimin. The open toe design prevents overheating, ensuring comfort. Recommended for those who have cold feet and difficulty sleeping in winter. *There is no outer packaging (only the socks inside), but they are new and unused. Please purchase only if you understand this. The dimensions of each sock vary. Even the left and right socks in a pair do not have perfectly matching dimensions. Two socks with similar dimensions are paired and sold as a set. Furthermore, the dimensions will change with wear and washing. - Size: 22-25 cm - Color: Medium Gray - Retail Price: 3500 yen per pair Currently, price reductions are not possible. They will be shipped via Yu-Packet Post on the same day or the next day.