After my 2 year old son had a potty accident in his car seat, I decided to buy the Diono car seat protector. I actually bought two so I would have a back up. My husband initially thought it would be a waste of money, but it has definitely paid for itself! When a child goes potty in their car seat, their urine actually drips down onto the actual seat of the car. So...I spent a little over $20 for two seat covers but had I not bought the seat covers, I would have spent over $100 to get my car cleaned. My son has had many accidents in the car seat cover and it has NEVER leaked through to his car seat. I think he actually had two accidents in the same car seat cover and it still didn't leak through. When I took the cover out, it was literally dripping! This product definitely works. My son no longer has accidents in the car, but I still plan on using these covers when we take long road trips. I absolutely refuse to put pull-ups back on him so these seat covers are a good solution to children who are in the beginning stages of potty training.
Also, I have washed and dried the seat covers many, many times. Both seat covers are still in perfect condition.