Kushitani's Proto-Core Leather is treated Mw/ fluorine. This treatment
makes the leather waterproof, yet highly breathable. A suit made of
waterproof leather will not keep you completely dry, due to seams or
perforation. However, it will prevent the leather from getting soaked
and heavy through either rain or the rider's perspiration.
If water penetrates the surface of leather, the natural oils of the
leather will dry out, and it will become stiff and brittle. Moisture,
and with it mold, can seriously harm your leathers. Not Kushitani's
Proto-Core Leathers. The easiest maintenance you'll find - just turn
them inside out, hang them and let them dry. And your leathers will be
as good as before.