Got this for my 3 year old’s bed. She’s potty trained, but still occasionally wets the bed. I chose this waterproof mattress pad based on the number of reviews and the high overall rating. But, based on my experience, this mattress pad did not keep the urine from leaking through onto the new mattress (which now has a urine stain/smell).

https://www.amazon.com/SafeRest-Hypoallergenic-Waterproof-Mattress-Protector/dp/B003PWNGQU