1, safe; 2, no pain; 3, no toxic or side effects; 4, cheap; 5. effective; People often say that "washing feet in spring, the rising sun, solid;" Washing feet in summer can dispel summer heat and dampness; In autumn, the feet are smashed and the lungs moisten the intestines; In winter, the feet are squatting and the abdomen is warm. "6. Convenient and comfortable.