Warm stimulation of the "Sanyoin" acupressure point on the ankle. The "Marude Kotatsu" series warms the body from the feet using specially developed heat-retaining and heat-generating materials. Like "Marude Kotatsu" socks, they are incredibly warm for cold feet. Size: 23.0-25.0 cm Unused, but will be opened and flattened for packaging to fit within 3cm thickness (original packaging also included). No price reduction planned. Color: Gray系 (Gray-based) Pattern/Design: Solid Sock Length: Mid-calf/Knee-high