Self-heating Comfortable, Elastic, To Penetration, Heating, Warm And Cold- Cotton Features: 【Keep Your Feet Warm】Made of polyester, soft and comfortable, long life. There is a design at the bottom of the, which can heat itself to 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 effect】Mild 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 circulation by removing, odor and swelling from the legs. 【Humanized Foot Fitting Design】Fit the foot, make the close to the sole, comfortable and not clumsy. Exquisite toe closure technology, high sewing strength, comfortable, warm and. 【Adjustment function】Use it at any 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 Comfortable】Winter warm are for outdoor activities, skiing, snowboarding, hiking, and other sports. The sole of the sock is designed with, which automatically warms in cold weather and relaxes your feet. Product details: Color: red Suitable for the crowd: size (38-45) Package: 1 pair of self-heating