DESC: The Safety 1st Natural Tranquility Mattress has 100% Organic cotton cover that is pure, soft and breathable. The Thermobonded core provides a firmer more evenly distributed sleeping surface and is made from Eco-Friendly materials. The mattress is Hypo-Allergenic and fits standard cribs and toddler beds. The mattress core is made with natural fibers and meets Federal Flammability Standard16 CFR 1633.