Engineered for optimal air flow for your baby's health and comfort, our Dri-Tec(R) 2-Stage Performance Crib Mattress is designed to provide a safe, comfortable, and clean sleep environment. Moisture wicking fabric and patented 3D ventilated mesh keeps air flowing to maintain ambient temperatures. Constructed with a 2-Stage Comfort Core, one side is specially designed with a safe, firm surface for babies 0-12 months. Flip the mattress over for a softer, adaptive side to support toddlers 12 months and up.