・ Brand new, unopened ・ Retail price: 3,900 yen ・ Color: Pink Beige These are a winter essential that protects your feet from the cold, made with FELCERA™ yarn, which uses body heat to generate comfortable warmth. The opening is ribbed, making it less likely to slip down. You can enjoy them either as over-the-knee socks or slouched down. The FELCERA™ yarn used contains a special ceramic powder that captures far-infrared rays constantly emitted from the wearer's body and returns (radiates) them, warming and insulating. The warmth from far-infrared rays, unlike that of moisture-absorbing and heat-generating materials, does not overheat and gently warms the body. Warming the body with far-infrared rays also helps to suppress body chills and promote blood circulation, so wearing them for a long time can be expected to support a comfortable environment for sleep, which is necessary for fatigue recovery. The fluffy and soft texture guarantees a satisfying fit.