Naturepedic's No-Compromise ™ Organic Cotton Classic crib mattress offers babies a healthy, natural sleep environment. Provides firm, comfortable support with 150 inner spring coils and border wire with a fire protection. Mattress surface is 100% waterproof, food-grade polyethylene. Polyethylene is an environmentally friendly, PVC-free plastic that provides the ultimate non-toxic, waterproof and stain resistant mattress cover.