Similar to the highly popular "Like a Kotatsu" series from last year, these are sock-type products that warm you from the feet up. Size: 23-25cm (for women) Material Composition: Acrylic, Wool, Others Thanks to a unique knitting method, they warm the San'in-ko acupressure point, which is a key point for warming the ankles, and keep your toes warm. The "necks" of the body – ankles, wrists, and neck – are where blood flow is concentrated. The secret to protecting your body from the cold lies in these "necks."