This is our 3rd or 4th order of masks since the pandemic began. We have tried masks from so many companies , and these really are the best. I like that they are 3 layers, and provide some of the best filtration on the market. They are machine washable, and very durable. There are no annoying filters you have to put inside them...they're not needed. The built in nose wire is easy to adjust. ( I wear glasses and have a very narrow nose bridge. ) Fogging is not a problem. They have improved them even more since my first order in 2020. They now have adjustable ear loops, and a built in strap, so you can wear it around your neck when in and out of masking situations. I have a small face, so the 7x7 is perfect for me. My husband is on the larger side, so the 9x9 is for him.These are well worth the money, and I have been gifting them to family and friends. Thank You!