This Dream On Me, Two-Sided 6”, Full size Crib spring coil mattress introduce a breathe flow technology . Our mattress is designed to fit standard full size cribs it features a 88 durable, interwoven, heat tempered, steel coils providing supreme comfort ,hypo-allergenic, CertiPUR-US certified layer for comfort these mattress are covered with a breathe –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.