I first learned of these masks after reading about a study CBC Market Place conducted with the UofT about the efficiency of several masks in the market in 2021. As this particular mask was one of the highest ranking masks in the study, my family and I decided to give them a try and have been wearing them systematically in closed environments ever since. Last year, my husband and son, attended multiple international conferences with thousands of maskless attendees and we have all travelled internationally. All I can say, is that so far, these masks have kept us safe and for this reason, I highly recommend them.