The Naturepedic No-Compromise? Organic Cotton Classic is simply the healthiest crib mattress available. It is waterproof, firm and eliminates potentially harmful chemicals from your child?s crib. It will provide your child with a more natural, healthy and comfortable sleep environment. Easy-to-clean 100% Polyethylene food grade waterproof surface. Made with organic cotton promotes a healthy and more chemical-free sleeping environment. Heavy-duty orthopedic innerspring and firm flat surface provide ideal support. Includes 150 coils. 28" X 52" x 6". Crib size also fits toddler beds.