Well made but too small for me
I hesitate to give this fewer than two stars, because it's well-made and sturdy, and its filtering mechanism is probably as effective as claimed. But it's too small to fit my face, and I am no giant. I stand 5'11" and weigh about 200 lb, and I can't get this mask to cover both my nose and my chin. It's hard to find a way to position it on my face and obtain the full masking efficiency of the device. I would not buy this again, and I would not recommend it to a friend.