Both are made of the same filter material, so their filtration performance and the way they are used and washed are the same.

Insert a piece of the sheet inside your mask. Make sure the sheet covers both your mouth and your nose. With rolls of YAMASHIN Filter Sheets™, first cut the roll to the desired dimensions (80 to 100 mm in length).

The sheets have no front or back side. They perform equally well in either direction.

Both are made of YAMASHIN NANO FILTER™ material. This material can be reused after hand-washing with gentle downward motions. With rolls of YAMASHIN Filter Sheets™, we recommend cutting the roll to the desired dimensions and stitching the four sides of the cut sheet to prevent loosening or loss of shape during hand-washing.
We have confirmed that the sheets show no degradation in performance even after being washed five times.

Hand-wash in lukewarm water with a small amount of mild detergent. Apply gentle downward motions. Rinse thoroughly in tap water. Shape and dry in the shade.

We recommend replacing the mask if you notice fluff on the surface or when the layers of the sheet begin to separate.