This mask is fantastic! I was using a mask that was graded for plaster and outside work before. It was so uncomfortable and I honestly don't know if it filtered out the fine plaster particles. The Base Camp mask is so good!! It's super comfortable and I can breath so well with it on. Some times I forget I'm wearing it after I'm done working and just go on about my day. It's very well made and the filtration seems to be really good. This will be my new go-to for any of my mask needs!