These masks are phenomenal and since I have been diagnosed with a lung disease, I needed a mask that fit over my oxygen installation and part of my face, which this mask did, and then some, and kept everything together the whole time. Great mask and I really safe when going to doctor's office (which is in the hospital) and you have to go through Emergency! One small thing, I see you have a small blurb on how you put the mask on but that is only a picture, but what you really need is a sheet of paper with instructions, step by step, on unfolding and putting it on. Thank you.