Recommend to use "non woven" textile. In my case I use make up remover disk, and you can change many many times, and also put disinfectant solution in to the disk. About size, you can change the scale in to slicer from 0.90 to 1.10 without compromise the fittest of the pieces, but also can adjust using hair dryer and change the form a little bit to fit your face, normally is not necessary. The design is made to adapt most of faces. Thanks.

good design I'm interested in buying it but I have these doubts Mask size? Compatible filters?