It can make the mask stick closer to the face, increase the sealing effect, and achieve anti-fog, dust, gas, and odor.Wearing masks for a long time will make the face feel compressed and tight, and the sponge strips on masks can add softness and comfort.For those who wear glasses, the sponge strip on the mask is a blessing for them. In winter, the breath exhaled by speaking makes the eyeglasses foggy, so the sponge strip can block the fog and make the eyeglasses clearer