Dream On Me, 2-In-1 Breathable 3" Spring Coil Portable Crib Mattress offers supreme comfort and quality. Our mattress is designed to fit portable/Min cribs it features interwoven steel coil that's wrapped in a hypo-allergenic, CertiPUR-US certified layer for comfort these mattresses are covered with a breath flow material on the infant side and a waterproof cover on the toddler side with lock stitch seams. Dream On Me mattress meets the Federal Flammability Standard.