• Winter heated socks with tourmaline design on the bottom that naturally and effortlessly warms your feet, without the need for electricity. • Stimulate the acupuncture points of the feet, providing a massage effect, fatigue relief, and improved blood circulation. • Made with high-quality cotton materials, durable, tear-resistant, soft, and elastic for greater comfort. • One size fits most men and women, with adequate thickness so as not to squeeze the feet. • High resistance in seams and elasticity, soft pure cotton texture. • Ideal for outdoor activities such as skiing, snowboarding, hiking, cycling, fishing, hunting, and winter sports. • Keep your feet warm all day in cold weather and help relax your feet. • The self-heating point must be in contact with the sole of the foot for best effect. • Includes 2 pairs of self-heating socks.