Why do you need Infant Car Seat Covers any way?  For the same reason you would buy a car seat cover for your car. To protect your investment for future resale value, and ease of cleaning.  Between the leaking baby bottles, drooling, and crumbs from crackers,or anything else your might give your baby or toddler, that infant/toddler carseat can become pretty filthy.  You might be able to do some spot cleaning, but you can't throw your infant carseat into the washing machine, can you?  That is the beauty of the infant Car Seat cover.  When it becomes soiled, you just remove it from the infant carseat, throw it into the washing machine, and it's good for another round.