this review title is: works as advertised but does not stay in place and the content is: very surprised that i can really really breathe when using these when i wear my cloth masks had to give only stars tho bc once i start talking it begins to slide down and i have to keep adjusting it does this as i am talking to people and tho they do not know what is going on inside of my mask it is pretty embarrassing to have to adjust what is in the inside of your mask as you are talking to someone.there are other information for this review, one is this reviewer did purchase it and the other is 0 people think this review is helpful.