Perfect Sleep Option for Baby! This is the only crib mattress you'll need for your child. The dual side features a firmer side perfect for infants and the less firm side is super comfortable for toddlers. It features high quality coil springs and extra thick gauge border rods to provide extra edge support, firmness and durability. The insulator support pad is made of coir fiber from natural coconut shell husks and natural latex. For extra comfort there are two cushion layers of non allergenic eco-foam. To protect the mattress the organic cotton cover has a waterproof backing.