Features 1. Keep Feet Warm: Foot Warmer made of high quality polyester with the properties of soft and comfortable, has a long service life. The bottom of the socks has a tourmaline design that heats itself to regulate blood circulation, heat to relax feet. 2. Self-Heating Effect: Mild fever, Heated Socks can be used for foot acupuncture point massage, and has a warming effect on feet feeling cold. Can relieve leg fatigue and regulate the nervous system. Self-heating eliminates moisture, odor and swelling of the legs to regulate blood circulation. 3. Humanized Foot-fitting Design: Fits the curve of the foot so that the hot spot is close to the sole skin, which is comfortable and not clumsy. Exquisite sock toe closure technology, high sewing intensity, comfortable, warm and durable. 4. Adjustment Function: Daily use any time of day. Wash under running warm water without detergents. Good therapy for the ankles and feet when frostbite. The bottom of socks has Tourmaline design which can self-heating to warm and relax your feet in cold weather. 5. Make Exercise Comfortable: Winter Warm Socks Ideal for outdoor activities, skiing, snowboarding, hiking, hockey and other sports. The bottom of the sock is designed with tourmaline, which automatically warms up in cold weather and relaxes your feet. Specification Material: Polyester Size: 38-44(24-28 cm) Color: Black, White, Red Weight: 37 g Package Included: 1 Pair x Heated Socks