Self-heating Socks Comfortable, Elastic, Penetration, Heating Socks, Warm Cotton Socks Features: Keep Your Feet WarmMade of polyester, soft and comfortable, long life. There is a design at the bottom of the socks, which can heat itself to blood circulation, and the heating can the feet. Note: The picture is the reverse side of the sock, it needs to be turned upside down when wearing it. Self-heating effectMild fever, the foot warmer can be used for foot acupoint massage, has a warming effect on the cold feet, relieves leg fatigue, and regulates the nervous system. Self-heating regulates blood circulation by removing, odor and swelling from the legs. Humanized Foot Fitting DesignFit the foot curve, make the close to the sole skin, comfortable and not clumsy. Exquisite toe closure technology, high sewing strength, comfortable, warm and durable. Adjustment functionUse it at any time of the day. Wash in running warm water without detergent. Good for ankles and feet in case of frostbite. The bottom of the sock is designed with , which self-heats to warm and your feet in cold weather. Make Sports ComfortableWinter warm socks are perfect for outdoor activities, skiing, snowboarding, hiking, and other sports. The sole of the sock is designed , which automatically warms in cold weather and relaxes your feet. Product Description: Suitable for the crowd: one size (38-45) Package: 1 pair of self-heating socks