They are on the FDA approved list and when I first bought them they were less than $2 each which was great value during the Covid. I'm a registered nurse and wear them under a level 2 surgical mask for my entire shift. They usually last a full shift before feeling itchy or frizzy. They are overhead, which makes them much more convenient and practical than overhead. The elastic is quite loose but when I tie them in a knot they fit perfectly. They fit perfectly and stay in place when my glasses don't fog up. I would still wear N95 at Covidstation but other than that this combo really worked for me. I reordered and the price went up but they were still better than the competition that isn't even on the FDA list.