12/24/22 EDIT: Recently got back from a 2.5 week trip overseas. I brought six of these masks with me, but only used one the entire time. That includes 18.5 hours of flight time, plus a 2.5 hour layover, each way, in addition to using it in populated areas almost every day. I had zero problems with it, including the elastic straps. See the product images (specifically the image of a face from the side with grids) for proper placement of the higher strap. For me, this strap worked best somewhere in between the top & rear of the head. (Maybe the upper crown?) The higher above the ears I went, the better the mask stayed on the upper portion of my nose without having to adjust it. Moving the strap too high was not as effective. Could not be happier with these masks. In my search for a quality "xl extra large male mask," I've purchased several sets of 10 and 20 masks which were listed as fitting that description. I've purchased some KF94's, and some reusable cloth masks with a filter-pocket (in addition to the cheap disposable masks, and also reviewing the measurements of many KN95's). I don't consider myself to be a large person, or to have a large head, but I wanted to be able to talk without constantly having the top of the mask slide down off my nose, or sliding up from under my chin. I also wanted a mask that actually filters the air (not just some cotton, polyester &/or other layer which does little to nothing). Finally, this mask fulfills my needs, where none of the others had. This mask has plenty of material under the chin, and the nose bridge strip seems to fit good as well, even while talking. Another plus is that there is plenty of space inside the mask, so it's not resting on my lips or feeling like it's going to go into my mouth while talking. Kind of a positive / negative is that it's an N95 (one of, if not the best mask rating readily available to the majority of us). I'm not a fan of the straps on the back of my head. However, this does produce a very good or better seal than the others, and it doesn't tug on my ears like the others. Additionally, I'm also a little concerned about the elasticity of the straps, although they feel fine for now right out of the box. The only real negatives are that these masks are not sold in quantities lower than a box of 50, and they are not individually wrapped. Overall, I'm extremely happy to have finally found something that fits me, and it's a quality rated mask that will provide good protection.
