We used these masks the entire pandemic and now we primarily use them on the plane or at the hospital or doctors visit. We got Covid for the first time in 2025(not masking at that time). I credit the continued use of these kn95 masks and the regular evolve together masks for us not getting sick at all, not even a cold since 2020. We have been very dilligent with using these masks and we have a great practice with using them correctly and taking them off correctly. My husband and I both worked through the height of the pandemic and not one infection. When we did get Covid it did knock us down somewhat, but I'm glad these masks helped us get through the more serious variants unscathed.