Not that great
I bought these as replacement on the Miller P100 mask but I don't think that I'll using them. I don't think this mask protects the welder from the toxic fumes as much as the cheaper one by 3m, the 3m resperator is bulky but works great. the Miller p100 fits great under the hood but somehow I always end up inhaling all kinds of fumes. when I am done at th end of the day, the inside of my nose is usually black from all the fumes and that doesn't happen with the 3M resperator.
Prosfits good under the welding hood
ConsDoes not work that great.