Fit runs small [SEP] While this was lightweight and very helpful allowing air to pass freely through my mask, the fit was not good. Whenever I spoke it moved and shifted causing me to need to touch my mask and readjust it to keep it from falling off my face. I ended up taking it out and finishing up my workday without it because I no longer felt safe having to constantly touch my mask to readjust. Maybe for a kid with a smaller face it may fit better but for an adult the fit is too small if your needing to talk.