This 2-in-1 Breathable Sweet Dreams 6" Crib and Toddler Mattress introduces a breath flow technology. The Cliff 2-Stage Waterproof Toddler Mattress is designed to fit standard full-size cribs and it features 88 durable interwoven, heat tempered, steel coils that provide supreme comfort. It is a hypo-allergenic, CertiPUR-US certified layer for comfort. These 2-in-1 Breathable Sweet Dreams 6" Crib and Toddler Mattress are covered with a breath-flow material on the infant side and a waterproof cover on the toddler side with lock stitch seams. This 2-in-1 Breathable Sweet Dreams 6" Crib and Toddler Mattress meets the Federal Flammability Standard, rest easy knowing this mattress is tested for phthalate and lead and constructed with quality materials and workmanship.