Every inch of the Newton Crib Mattress was designed with your baby’s health, safety, and comfort in mind. The innovative design allows air to flow freely for optimal breathability and temperature regulation. The washable material prevents bacteria growth – and allows you to rinse off any less-than-adorable moments. The Newton Crib Mattress’s perfect level of cushy firmness helps your baby stay asleep. The core is made of 90% free air – yes, air and 10% food-grade polymer. It’s all wrapped up in a breathable, three-dimensional fabric that provides comfort and unzips for easy washing. The Newton Crib Mattress contains no foam, latex, springs, glue, or allergens and is 100% recyclable.