Built with the strength and durability of an innerspring mattress, this Rooms To Go exclusive Naturepedic crib mattress presents a 2-stage dual firmness design without the added weight. Layers of organic cotton offer the perfect balance of firmness and comfort with the added benefit of long-lasting durability. Its 2-stage design has a firm side to support growing infants and a cushioned side to adapt for toddler use. Built with Naturepedic's exclusive patent pending wavesupport technology, its core is made from pure food-grade, waterproof polyethylene. Naturepedic is a Global Organic Textile Standard and Greenguard Certified manufacturer that has earned the trust of moms and doctors across the country. Limited Lifetime Warranty