Just warm your feet and your heels will be smooth. The heel socks are warming socks developed by Japan's first intimate zone salon, "Pyupicare," based on customer feedback. (Also recommended for yoga socks) Since important gynecological pressure points are concentrated around the heel and ankle, these are the most important parts women should care for daily without getting cold. The socks use cutting-edge superfer vests made from yarn (photoelectrons) kneading far-infrared radiating ceramics for people working in extremely cold regions. By emitting far-infrared radiation from photoelectric fibers, they maintain natural warmth and provide ecological insulation, making them excellent socks. Just by wearing them and warming up around your heels, your whole body feels cozy, and with continued use, even rough heels become moist and smooth. A convenient item that can be worn barefoot, over tights or socks, and can be used for remote work at the office or from home, as well as during studio sports like yoga and Pilates. It's a simple item that warms your vulnerable ankles, making it perfect for any occasion. [Commitment to Product Development] This product is developed and manufactured in Japan, using the "Super Farvest (Optoelectronics ®)" technology, which helps maintain body temperature in extremely cold regions as winter wetsuits for the Self-Defense Forces and Japan Coast Guard, as well as winter gear for mountaineers. The rubber used as the middle material for the socks is also made in Japan with an environmentally friendly oil flue made from limestone from Mt. Kurohime. Handmade by skilled artisans using all-Japan materials, the outstanding wetsuit manufacturing technology that protects lives in the freezing sea achieves a three-dimensional comfort in the heel socks.