Hello, the principle of the old Beijing foot patch is to stimulate the acupoints on the soles of the feet with medicine bags, so as to dredge blood vessels and strengthen circulation and excretion. Generally, the elderly will feel relaxed and flexible after using the foot patch, especially the numb parts of the body will be improved. In addition, it can also relieve some symptoms such as hypertension, rheumatism, insomnia and constipation. All the above are practical results, I hope it will help you.