treadtread, I suspect they're fairly water resistant or maybe even waterproof. They know where this stuff is going. But if rain is heavy, I suspect Saran wrap would work OK.
I rode to work today for the first time in a few weeks. I really have to do this more often. I feel great, and my mind is so much more awake. I think of my cycling route to work as long and hilly, but my view of it is changing slowly. I took a slightly longer route, and it was about 14 miles. I took exactly an hour, and my computer, of course, said I averaged 14.0 mph. None of the hills felt difficult. I went at what I would call a moderately strong pace but I wasn't pushing myself. I ought to be able to push it hard occasionally, so I will try doing the whole route hard from time to time, just to build strength and endurance.
Weather is cool and damp and overcast. I wore a merino wool long sleeve polo shirt with a wool jersey on top. I was overdressed, but since both layers were wool, I didn't overheat, and I didn't want to go through the trouble of peeling off a layer. I was fine, and I dried off very quickly once inside.
I put a front rack on my bike and also fenders. For the time being, I can't attach my dynamo headlight, so I'm using a decent battery light. I ran it on the way in, figuring a daytime running light may not do any good, but it doesn't do any harm, and maybe it helps people see me. I also run my taillight on "steady" in the daytimes.
I shot this as soon as I arrived at work.