Review on 6Pack Black Silicone Internal Breathing Bracket by Sean Bouchard

They don't fit any mask I have, even the big ones that swell up too much on my face. Even if they did, they crumple towards your face when you position them, so you're essentially chewing on them if you move your mouth at all. They are too thin to withstand heavy breathing (mostly I wear them for sports and they are completely useless for that). Even though they are too big, they don't even stay in place, slip and don't hold at all.