Great, and was able to adapt it for my kid.

So I have a box of the 8511s from a local hardware store, and also a box of store brand... and these are far and away more wearable. We're in the Oregon Smoke right now, AQI at 400+, and these make the headache go away pretty much instantly. I have sensory issues, and where the cheaper masks are itchy, these are silky soft. Moreover, I've been able to use gorilla tape to take down the size for my five year old, who has tolerated it for hours at a time. I'm adding pictures of the process I used. Not the "ideal solution" for kids, but far better than nothing at all when the smoke is this bad. Leaks are minimal to none and the only place the tape sits is where the mask touches the chin--not where air would be coming through anyway.