Get a replacement or extra cover for the Organic Breathable 2-Stage Baby Crib Mattress. This layer combines breathability and waterproofing for a safe, healthy, hygienic design. The cover features a soft organic cotton surface and a 3-dimensional polyester lattice structure that creates a breathable space under the baby for inrcreased airflow. This results in improved temperature regulation for less sweaty backs and a reduced risk of overheating. It also allows the baby to breathe directly through the sleep surface if necessary. Additionally, the cover also features a waterproof backing which protects the mattress from urine, spit-up, and other messes, making crib changes easy. Get all the safety and comfort benefits of a breathable mattress with the convenience and practicality of a removable and washable pad.