With the No-Compromise Cotton Classic 150 Seamless Crib Mattress from Naturepedic your baby will be sleeping in a safe, healthy environment. An innerspring is orthopedically designed, covered with organic cotton filling and finished with a moisture-resistant cover for long-lasting safety and style. Each material has been carefully selected to create a hypoallergenic mattress perfect for your little one's safe, comfortable sleep. Sweet dreams!