The Lullaby Earth Breathe Safe 2-Stage Crib Mattress consists of a non-toxic waterproof mattress and a removable washable, waterproof, breathable pad. It is non-toxic, waterproof, hygienic, with proper support, giving you everything you need for your baby's safe sleep. The dual-firmness design flips from a firm infant side to a cushion firm toddler side. The breathable pad provides an airflow layer between the baby and the mattress and enhances breathability when the baby is face down.