The difference between the first and second grade of varicose elastic socks is mainly the difference in pressure. The pressure of primary compression is relatively low, and the pressure of secondary compression is higher than that of primary compression, which can not only play a certain preventive role, but also play a certain therapeutic role. First-class pressure is more comfortable to wear, but the pressure is low, which can only prevent varicose veins, such as teachers, doctors, nurses and other people who stand for a long time, and can relieve leg pain caused by venous congestion. The secondary drainage account is mainly used for people who already have varicose veins and have obvious symptoms. I wonder if my answer can satisfy you. Thanks for your support.