this review title is: too much plastic impedes breathing and the content is: great premise but the structure of this frame contains too much plastic which blocks quite a noticeable amount of air compromising the breathability of a mask i suspect all of the available plastic brackets are similarly problematic i gave it an extra star for its very reasonable price my intent is to see how much of the frames structure i can retain while cutting away as much as possible of the plastic to see whether i can improve the breathability of the mask while using this frame inside it.there are other information for this review, one is this reviewer did purchase it and the other is 1 people think this review is helpful.