The sole of the socks is designed with natural tourmaline hot spots, which can keep your feet warm anytime and anywhere by self-heating, no electricity needed and no time and region restrictions . Super elastic and stretchy, one size fits most men and women. According to foot reflex theory, use high-quality natural hot spots to stimulate the acupuncture points of the feet to to achieve a massage effect, stimulate blood circulation, focus soothing heat on the soles of the feet and toes, thereby improving blood circulation in the limbs and helping to protect the feet from the cold. Manufactured Made of high quality cotton, thick and well padded, soft and comfortable, absorbent, breathable, quick-drying, elastic, has a long service life. Fits the curve of the foot design so that the hotspot is close to the soles of the feet, comfortable and warm to wear. Ideal for various outdoor sports activities, such as hiking , skiing, walking, running, cycling, mountaineering, winter fishing, jogging, winter hunting, ice hockey, snow removal, etc. It is also a great gift for your parents, friends and families, when you are still worrying about what to give for Christmas, Thanksgiving or other holidays, the heated socks are a warm and thoughtful gift. p The pictures are just to show customers the hot spots, the correct way to wear the socks is that the self-heating point on the sock should be in contact with the soles of the feet, not the soles of the shoes .