This Dream On Me Two-Sided 3" Mini/Portable Crib Foam Mattress introduces a breath flow technology. Our mattress is designed to fit standard portable cribs it features 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, rest easy knowing this mattress is tested for phthalate and lead and constructed with quality materials and workmanship.