Yusung Pile & Fin Weatherstripping is specially treated to prevent penetration by UV light. As a result it maintaints a semi- permanent life.

When it is exposed at xenon arc light
for640 hours, it preserves over 80% of
its original shape, thus passing the
test for high quality.

Each segment of the thread in Yusung's pile fabric has an excellent contractile and
restoring force thanks to the adaptation of
TRILOBAC FILAMENT which is specially
designed and manufactured for Yusung.
Thus, it can easily withstand pressure from any side, and can perform its original
function semi-permanently.

After dropping five drops of distilled water,
after five minutes later, any drop of five
drops should be penetrated, and the original
shape of the drop should be preserved.
Rewrite. I can't figure out what happened.
Presumably the 5 drops did not penetrate
but preserved their original shape, indicating
that the material is waterproof.