Self-heating socks are made of high-grade materials, which are practical and durable. The bottom of the socks has a heating design, which can be heated in cold weather. T he bottom has the self-heating principle of the soft glue with daily heating, with mild heat, and has a warm effect on the cold feeling of the feet. Features -Color:Assorted Color -Material:Cotton -Size:28.00X9.50X0.20cm/11.00X3.73X0.08in -Self-heating design. It is suitable for skiing, climbing, skating and cycling in the cold winter. - Using high-grade materials, durable and safe to use. Very suitable for those who are afraid of cold. - Effectively relieve leg pain and fatigue, regulate the nervous system, and provide you with foot massage care. - Comfortable and light, no matter indoor or outdoor activities, it can give you intimate care and companionship. - This heated sock has a practical mid-tube design to ensure good warmth and keep you warmer. Package list4 x Pairs of Socks