Originally Posted by
Ziemas
I commute daily in all weather on a Brooks, and I've found that using a heavy duty plastic shopping bag keeps my saddle dry in all conditions while locked up on the street. I've been doing it for years with no ill effects.
As for riding in the rain or snow, I simply ride without covering the saddle. I have fenders which shield the underside of the saddle, and my butt shields the top.
FWIW, I ride a lot in the rain and snow.
Likewise, I commute year-round in Seattle rain on a leather saddle and don't have any trouble with it. Fenders keep it dry from below, my body keeps it dry from above, and when parked or on a bus rack, I use a waterproof drawstring bag over it to keep it dry.