The Sealy Butterfly Crib and Toddler Mattress collection is made with CERTIPUR-US® Certified foams that are firm, supportive and non-toxic for babies. Plus, you can have confidence in the quality, workmanship and safety testing of our locally-made foam that is engineered for lasting firmness and durability. Packaged in a small box and delivered compressed and rolled inside. It immediately "butterflies" out to take shape into a full standard size crib mattress for a snug fit inside cribs and toddler beds. The Sealy Butterfly 2-Stage Breathable Knit Ultra Firm Crib Mattress offers a grow-with-me design, made with a high-density foam side and a comforting soybean memory foam side. Our foam is marked with the infant side for families using it during the newborn stage. This model is wrapped inside an airy knit fabric zippered cover that is breathable on baby’s skin. The cover can be placed in the wash for easy cleaning. A waterproof barrier keeps liquids from seeping inside your baby’s mattress to help maintain lasting freshness.