This Dream On Me, Two-Sided 6", a Full-size Crib spring coil mattress introduces a breath flow technology. Our mattress is designed to fit standard full-size cribs it features 150 durable, interwoven, heat tempered, steel coils providing supreme comfort, 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.