Waterproof yes, but wetness needs somewhere to go...
These pads are certainly waterproof, but they capture very little so baby's urine will run off and possibly get you or the changing table wet anyway. They wash well enough, not too much pilling. They shrink and reshape a bit ( and they are all a little different from each other), but no big deal considering their purpose.
Good size for changing table
ConsDon't absorb enough to prevent mess