"Bought a few of these as had been using the cheaper folding ones with rubbish elastic for a while. Good fit, pretty comfortable, easy to breathe in and, best of all, my safety glasses have stopped steaming up."
"I have bought quite a few dust masks recently as completely refurbing a flat. The fold flat ones dont seem to last five minutes, these do at least keep going. The downside is they get very hot and sweaty as you work, the upside is they are reliable. They are fairly expensive, but given the ones half the price only last about a day then they are a bargain."