Review title is Too much plastic impedes breathing [SEP] 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 frame's 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.