This is the only under welding helmet face mask/respirator that directs your breath down and away from the welding helmet or face shields viewing area/lens I could find.
I wasn't sure if I needed the large, medium or small until I found a comment from 3M saying that the medium fits the majority of people.
The strapping system looks and feels fragile but knowing this and once I adjusted both straps to feed the bottom neck strap a more it hasn't been a problem. In fact once the neck strap is on, the top strap goes on and comes off quite easily and lays the mask on the chest/neck comfortably.
Mask fit is much more comfortable then my dual side cartridge (expensive) respirator and my single front filter respirator.
Eye wear sits on nose piece slightly but for me its not an issue.