Our Far Infrared Tourmaline Acupressure Insoles contains 80%PVC and 20% magnet. 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. The way to use it is very simple: you can first cut the insole according to the size you need, and then put it into the shoe. It improves blood circulation and reduces leg swelling and varicose veins.