Its not the n95 part its the general nature of the disposable dust mask. They are Paper And often made in one size. They do not seal off perfectly if at all. I have used "High end" N95 masks and have found much of the stuff I ddint want to breath on my face under the mask...Not fun...Nothing works better for the price then a 20$ silicone half mask. Its reusable with 12$ For 4 Pink P100 (Better then N95) Filters (You use two at once btw).