2 Pairs Self Heating Foot Warmer Socks, Breathable Winter Socks for Outdoor Hunting Camping Hiking Skiing Unisex Size 37~44 Super value self heating socks: made of high-quality polyester cotton, water absorbing, breathable, fast drying, and elastic thickening. There is a tourmaline design at the bottom of the sock, which can self heat, warm and relax your feet in cold weather. Self heating function: powerful self heating function, which can increase the temperature by 5-8 in a few minutes, can continue to heat, and can withstand the cold of minus 20 . The heated socks have massage points, which can stimulate the acupuncture points of the feet to achieve the massage effect. Humanized foot fitting design: it fits the foot curve, making the hot spot close to the sole skin, comfortable without clumsiness. Exquisite toe cap closing technology, high sewing strength, comfort, warmth and durability. Unisex: warm socks designed for men and women of medium size. This super elastic, stretchable heating sock is a size suitable for neutral adults. Make sports more comfortable: whether your feet are cold or winter cold, this self heating sock can handle it calmly and is suitable for various outdoor activities, such as mountain climbing, skiing, jogging, hunting, cycling, etc.