Marude Kotatsu Socks Set of 2, New and Unopened. ⚫︎Colors: Black, Mocha Brown This is the sock type from the "Marude Kotatsu" series, which warms your body from your feet using patented technology. By providing thermal stimulation to the acupoint "Sanyin Jiao" on the ankle with special material, it warms you from the inside out. You'll be enveloped in warmth like a kotatsu. [For air conditioning in summer and cold floors in winter] Great for situations where your feet tend to get cold, such as desk work in the office, teleworking, standing work, or doing chores on cold flooring. The warm material wraps from your calves to your toes, making it recommended for those who get cold easily ◎ #Onkatsu #ColdProtection #ColdWeatherGear #RoomSocks