It is not ordinary socks, it is by the force and distribution, the establishment of maximum support pressure in the ankle, gradually decreasing upwardly along the leg, in the calf reduced to 70%-90% of the maximum pressure value in the thigh reduced to 25%-45% of the maximum pressure value, this decreasing pressure changes can lower extremity venous return, effective relieve or improve venous and venous valves are under pressure. Strict examination and approval by the State Food and Drug Administration, certified "stockings" only with the prevention and mitigation of varicose veins effect, but not achieve therapeutic effect. When transportation valve damage, the upper ankle mild swelling, itching and skin pigmentation and other symptoms, you need to go to hospital.