TOTALLY waterproof!  I love that I can lace them up to give my ankles the right support, but them leave them laced the way I like them and zip and unzip them to get them on and off!  Very comfortable too!  I ordered a 7 2E because 6.5 didn't have that width, but they fit pretty much perfectly, so you might consider ordered a half size larger if you run in between or something.