Dream On Me, Breathable Orthopedic Extra Firm Crib Mattress- features a 5“ core for your baby comfort which includes a breathe flow technology. The CertiPUR-US certified layers mattress is 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 in the USA.