I bought these masks several times throughout 2020 and 2021 and found them to be comfortable and well sealed. However at some point in 2022 the format was changed significantly. They lost much of the sturdiness of the “boat” portion, the flaps are significantly smaller and perhaps most importantly the metal nose piece is much flimsier and does not hold its shape. These masks are unusable compared to the older version as they do not even remotely seal to my face, which is of course the whole point. If you got the older version of this mask from this company don’t bother trying to restock now as these masks are terrible in comparison.