I love love love these respirator masks! This one in particular because it has a valve so my glasses don't get foggy, which is a HUGE annoyance when you're in the middle of a project -- and depending on what I've worming with (solvents, etc) can be quite dangerous to not have full vision. I wear these when I work with oil-based paints, which is often. I've tried about a zillion masks over the years and am glad I finally found one I like that works for my purposes. You can find them cheapest on Amazon, and even cheaper if you're a Prime member.