Serta Nightstar Super Firm Crib and Toddler Mattress: * Top inside layer features exclusive Serta Fireblocker for safety * Exceeds federal and state flammability standards (16 CFR part 1633) * Heavy-gauge coils provide a super firm surface with balanced support * Polyester layer offers additional comfort and support * Four mattress vents to keep sleeping environment fresh * Balanced support from full perimeter border wire when baby is standing * Vinyl cover is specially treated to provide anti-bacterial and anti-microbial protection * Edges are bound with heavy-duty cloth binding and lock stitching * Mattress also fits toddler frames * Mattress wipes clean with a damp cloth * Crib and Toddler Mattress has a 35-year warranty against manufacturer"s defects