Warm stimulation of the "Sanyinkou" 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 the "Marude Kotatsu" socks, they are incredibly warm for cold feet. Size: 23.0-25.0 cm Although unused, the item will be opened and flattened for packaging to fit within a 3cm thickness (the original packaging will also be included). There are no plans for price reduction.