Mask thickness is not equal to the protection effect, the thicker the mask, the better the anti-virus effect is not. Medical surgical masks are relatively thin to the touch, but the filtration efficiency is high. The three layers of water-blocking layer, filter layer and moisture-absorbing layer effectively block the virus invasion. The general cotton masks on the market, although thick, but basically do not have the role of preventing infectious diseases. Between the new coronavirus epidemic is still on the rise, if you go to general open public places, not close contact with respiratory patients, wearing medical surgical masks is sufficient, no need to over-protect. However, if you will come into contact with patients suspected of having respiratory infections, you need to wear an anti-biological N95 mask to provide effective protection.