"Every crib and toddler bed needs a mattress, and the Graco Crib and Toddler Mattress-in-a-Box is the perfect addition to complete your crib. Designed to fit any standard full-size crib or toddler bed, the Graco Crib and Toddler Mattress-in-a-Box is GREENGUARD Gold Certified, has a CertiPUR-US Certified foam core, and is certified by the Juvenile Products Manufacturers Association (JPMA). This award-winning mattress is the proud recipient of the Parent Tested Parent Approved (PTPA) Seal of Approval, 2021 & 2022 Women's Choice Award for 9 out of 10 Customer Recommended Crib and Toddler Mattress, the National Parenting Product Award (NAPPA), and the 2021 JPMA Innovation Award for the ""Tried and True"" category. The Graco Crib and Toddler Mattress-in-a-Box features a soft, removable, water-resistant outer cover that can be conveniently machine washed. The mattress has a firm, breathable foam mattress core that is the recommended firmness for infants' safer sleep. For optimal performance, we recommend that you carefully unbox your mattress and allow it to expand immediately upon delivery to allow maximum time for its full expansion, in a room temperature setting."