The fit of the fit was perfect. I tested it by closing the inlet and exhaust, but there was no air leak at all. It would be even better if the water dripping from the exhaust port managed somehow. Although it may be because it is cold material when worn on the face, it becomes matter of concern.
Until then I used a disposable DS2, but I have purchased this product this time due to pressure sense, cloudiness of my glasses. There is no sense of pressure and close contact with the face is perfect, so the eyeglasses will not cloud. It smells of fumes and it is really useful and useful. In addition, I would like to see how long the filter can be used for sustaining the function.