These are Okamot's Marude Kotatsu Socks, designed for sleeping. They use heat-generating material to warm two acupressure points: Sanyinjiao and Shenmen. The open toe design prevents overheating, ensuring comfort. Recommended for those who have cold feet and difficulty sleeping in winter. *Please note: The outer packaging is not available (only the socks themselves), but they are new and unused. Please purchase only if you accept this condition. The dimensions of each sock vary. The dimensions of the left and right socks in a pair are not exactly the same. Two socks with similar dimensions are paired and sold as a set. Furthermore, the dimensions may 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.