Spring Breeze 4-inch Mini Crib Mattress made from sustainable materials is safe for your baby, for you, and the environment. The Cloud Core’s open-air construction provides continuous airflow that babies can breathe right though. For easy cleanup, a waterproof barrier protects the hypoallergenic core that is mold and mildew-resistant while the fully removable cover is machine washable. Dual sided to accommodate the sleeping needs of growing babies, this mini crib mattress features the firmness level newborns need on one side and an additional comfort layer on the other side as your child matures.