Safety 1st Heavenly Dreams White Crib Mattress is firm, lightweight and waterproof. Its vinyl sleeping surface is hypoallergenic and free of phthalates and lead. The sturdy cover is tear resistant, but also resists stains and odors. Its high density thermo-bonded fiber core provides firm and long lasting support. Fits all standard cribs and toddler beds. Meets federal flammability standard 16 CFR 1633 without the use of potentially harmful chemicals, because at Safety 1st your baby's safety is our number one priority.