Made of soft organic flannelette material, the breathable and waterproof Organic Crib Mattress Protector Pad is the perfect choice for your toddlers during potty training. The mattress protector is made with two layers of soft organic flannelette; and tucked in the middle is a thin polyurethane membrane, which is child friendly and breathable. A great idea for making your nursery more green and eco-friendly.