NOTE: Our mattress meets the Federal Flammability Standard CFR-1633. The fabric does not contain any flame retardant materials. The fire resistant property is achieved through a layer of thin cotton-like material manufactured under license of DuPont Chemical. This layer of material is covered under the cotton fabric and does not come in contact with the users. Moreover, we use a flame-resistant thread-- Kevlar T-60 to make our mattresses.