The babyGap TrueSleep Crib and Toddler Mattress is as cool as it gets. The advanced temperature regulating cover will helps your baby achieve their optimal temperature by pulling heat away from the body or releasing it back when needed, for a truly personalized sleep experience. Its firm yet comfortable core is made from over 300 recycled water bottles, making it a healthy choice for your baby, and the environment. Designed to grow with your baby as they develop, this mattress features two distinct sides to accommodate your childs sleep needs, a firm for infants and targeted comfort for toddlers on the other side. A waterproof backing on both sides allows you to flip the mattress when it comes time for your baby to move from the crib to a toddler bed. Plus, its GREENGUARD Gold Certified, which means its built to contribute to cleaner air for a healthy home.