I’ve been using the white kn95 masks for a few years and will continue to do so due to being immunosuppressed. I had tried many other brands but these are the easiest to breathe through due to their design. Over the years there were only two packs that had a defect and the company immediately sent replacements with additional masks thrown in. I’m continuing to order them; it’s a very good company to deal with and the mask quality is very good!
