The BEST breathable and machine washable mini crib mattress for your baby! Breathe easy every night with the Delta Children Spring Breeze 4-inch Mini Crib Mattress. Its breathable soft knit cover and innovative Cloud Core 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. This mini crib mattress is GREENGUARD Gold certified. Tested to meet or exceed the most stringent chemical emissions standards to create a healthier home for your baby, it has been screened for more than 10,000 chemicals and VOCs that are known to pollute indoor air. Certified to contribute to cleaner indoor air, you can feel good about putting this mattress in your child's nursery.