We are in the middle of potty training and my son insists he only wants to wear big boy underwear. I bought this hoping it would save me from having to take his carseat out of the car to clean after every accident. Although this seat protector does contain a lot of the urine, the carseat still gets wet. If the child moves around while getting in their seat and doesn't sit in it perfectly where all the sides of the seat protector are perfectly around their bottom, it leaks through the sides. It also leaks at the seatbelt part. With that said, it works great for water spills and helps contain food messes.