It's absolutely waterproof. I've ducked under water and only my head gets wet. No cold trickles down the neck, which happened with every other jacket I've ever worn before. And unlike most tops made with breatheable fabric, it'll stay that way unless you tear it on a hook or on rocks.
I think they also have a separate hood available, too. I can deal with my head getting wet by waves or spray, but downpours may be another story
