I completed the Glasgow to Edinburgh ultra marathon, 56 miles through an ber weather warning! I had rain from start to finish, 13 hours I was exposed to the elements and not one part of my jacket let me down!!
I wore my hydration vest under my jacket as that wasn't waterproof and the fit was still bob on. I was still able to access my drinks due to the double zips.
As a double bonus, it has a lovely soft material that doesn't make that awful noise some waterproofs do!