The original version had no nose bridge to pinch.
The second version had a twistie tie covered
with white fabric duct tape as a nose pinch.
This third version in a slightly bigger size
has a plastic nose bridge with double wire
laminated. I used a zigzag stitch to secure it.
Today's 4th version has the nose bridge
(and a larger size for adults, XL) in
a stitched pocket at the top.
But it also has a slit in the back
for inserting a filter,
This was a request from a grandson who
is returning to college as a senior.
It slides right in.
And will lay flat in the folds
The filter adds extra protection
closer to a N95 mask.
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