Sleep easy knowing that your baby is sleeping on the best crib mattress for breathability, safety, and comfort. The Air-X® Performance® Crib and Toddler Mattress is a 2-stage lightweight, convertible mattress, that grows with your baby. Plus, our removable, washable inner layer is engineered with our patented Air-X technology to enhance airflow and provide a comfortable sleep surface for your baby. The waterproof barrier protects the core for a clean and healthy sleep environment.