Your little one will sleep soundly on this 2-Stage Waterproof Standard Crib Mattress, which has 202 heat-tempered, innerspring coils, a waterproof cover with a lock-stitched binding that resists stains, mildew, and moisture for a healthy sleeping surface. The thick-gauge perimeter border wire gives stability right up to the mattress edge to meet the unique demands of the infancy and toddler stages. This Dream on Me Mattress meets Federal Flammability Standard 16CFR 1632/16 CFR 1633 and for a healthy indoor environment for your baby. Please ensure Mattress covers or fitted sheets are not too tight or loose over a crib mattress for safe sleeping.