Love these masks. You can tell they are working as they move in and out as you breathe, so the seal is pretty good. The wire over the nose holds it to a good shape. Couple of minor niggles, I had to cut the elastic and retie so they go round the ears rather than over the head and the sewing of the channels the elastic goes through is not consistent. I could pull the not through on one side of each of the masks I bought but not the other as the sewing had gone through the elastic as well. Having said that, they are comfortable and look fabulous. I highly recommend them.