Until now I used a normal flat mask, but I tried with this product because my eyeglasses got cloudy with my breath and my visibility got worse. Of course the mask of this shape surely covers the nose mouth cleanly, vomiting breath is difficult to leak to the top and cloudiness of the eyeglasses has been considerably reduced. The obstruction of the visibility of the work was hardly felt, but again the feeling of pressure around the mouth was strongly felt because the sense of oppression was different from the flat mask so far, and it was bothered by using it for a long time I will. I think that this discomfort increased if it was in the summer. I think that it is unavoidable that a sense of oppression to some extent is unavoidable because it seems that mask use is the best for countermeasures against dust. I think that it is a commodity to repeat if you get used to because I think that it is a sufficiently practical item in terms of price.