The Colgate Eco Foam Supreme EC500F is made with ecologically friendlier foam that uses plant oils to replace petroleum based oils found in regular foam mattresses. The Colgate Eco Foam Supreme EC500F mattress is an ecologically friendlier version of the Colgate Foam Supreme value priced foam mattress. It is made with performance tested CertiPUR-US® certified ecologically friendlier foam. The mattress is firm like most medical experts recommend for babies. The Eco-Foam Supreme has a waterproof damask cloth cover with the waterproofing on the back side of the cover and cloth closest to baby's skin. The waterproof backing lets nothing inside the mattress.