Keep Feet WarmThe bottom of socks has Tourmaline design which can self-heating to keep your feet warm anytime, anywhere, no need to use electricity, no time and geographical restrictions Cotton MaterialMade of high-strength cotton materials, soft, elastic thickened and comfortable. One size fit most men and women Foot MassageUse high-quality natural hot spots to stimulate the acupoints of the feet to achieve a massage effect, relieve leg fatigue, regulate blood circulation. Using the tourmaline socks while walking is a natural and relaxing way of foot massage Ideal for Outdoor ActivitiesKeep your feet warm in cold weather. Great for climbing, skiing, winter fishing, jogging, winter hunting, biking, hiking, ice hockey, and shoveling snow etc. NoteThe self-heating spot on the sock should be in the contact with the soles of the feet, not on the shoes sole. 3 pairs of self-heating socks are convenient for you to replace and clean