★Important★ Please be sure to read the self-introduction and product description to the end before asking questions or making a purchase. Socks Supplement: Just Like a Kotatsu Socks 【Limited Color】Grayish Purple It wraps your feet from the toes, providing a comfortable warmth as if you were in a kotatsu (heated table). Using Okamoto's uniquely developed special insulation and heat-generating material, we have created warmer socks. The secret is the thermal stimulation of the ankle. The ankle, which tends to draw in coldness, is covered with a heat-generating material. The San'in-ko (acupressure point) on the ankle is warmed by thermal stimulation (patent pending ※). (※ Thermal stimulation Patent No. 6043982)