J.W.
my neighbor recently told me she uses just a plastic zip around cover that she got at WalMart for $5. She uses is for all 3 of her kids (one has allergies and another has accidents). So I bought two of them for my guys and LOVE it. I use to use the fabric waterproof mattress covers but urine would still be able to seap through somehow. No issues with this new cover.
Good luck!