Our Tourmaline Acupressure Insoles contain 20% magnet and 80%PVC. It can improve blood circulation, relieve leg swelling, eliminate varicose veins, and help maintain body temperature. Wearing it regularly will help your legs get natural relaxation and comfort. Efficient use of body heat, minimize sweat and moisture, and stay warm and comfortable in weather below 35 degrees. Its use is very simple: put the product on the sole of the shoe. Promotes blood circulation, eliminates swelling and varicose veins, and helps maintain body heat.