Design: Two ways to wear-by putting the printed side of the socks inside, it can stimulate blood circulation, the feet and keep them warm. The socks need to be worn on the flip side, and the side with the pattern must be worn inside to self-heat. Please ensure that you are wearing them in the correct way.You can also put the patterned side of the socks outside to avoid slipping on the floor, easy to match different kind of clothes. Material: made of polyester material, breathable, comfy to wear and wash well, soft and comfortable, long-lasting and does not shrink after washing, durable and tear resistant.The 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 Size: one size fit for most men and women foot size from 39-44, these washable socks are flexible and will perfect for your feet. You can the detailed size in the picture. Application: heating socks are great for trainers walking, jogging running, fitness, excellent present for Christmas, Birthday and Mother's day etc.Ideal for outdoor activities keep your feet warm in cold weather. Suitable for all kinds of outdoor activities, Great for climbing, skiing, winter fishing, jogging, winter hunting, biking, hiking, ice , and shoveling snow etc. Promote blood circulation :Use high-quality natural hot spots to stimulate the acupoints of the feet to achieve a massage effect, relieve leg fatigue, blood circulation, enhance body resistance. High-quality soft material, not easy to damage the skin. All colors are not easy to fade. Cotton is the material to keep warm in winter The complete geometry is not easily deformed. The heating socks are made of high-quality cotton fiber. They are soft, absorbent, quick-drying, breathable and elastic. Insulation materials can provide you with safe socks to keep your feet warm and comfortable in the cold winter. Combining with ergonomic design, the winter warm socks can be evenly heated and the temperature is stable, which can stimulate the blood circulation of the feet, so that the feet are no longer cold and stiff in winter. 1 pair of socksnull