Car Seats

I know its obvious why childrens car seats are made with water proof material..but in the summer its proving to be uncomfortable for my one years skin...heat rash! ! any advice on a better seat or a way to reduce the heat factor in his graco one?

Go to babys r us or some other kidrens specialty store... they make special carseat covers that allow the buckles to go through.the towel is a nice idea but the buckles must be able to be in place properly