The Foundations Infapure Mattress meets or exceeds all federal flammability standards without adding any chemical flame retardants, such as tris, to provide clean, safe, quality air for your little one. Each of the Foundations Infapure Mattresses are made of highly durable nylon and reinforced, ultradurable vinyl material. As for the foam, the Foundations Infapure Foam Mattress is made of virgin foam with no chemically added flame retardants. Each Foundations Infapure Mattress is made to fit perfectly into the Foundations crib of your choosing to ensure it remains fully compliant. The Foundations Infapure Foam Mattress is available in three different thickness sizes: 2-inch, 3-inch, and 4-inch. The Foundations Infapure Foam Mattress is compatible with several of Foundations’ mini, portable, and compact cribs, including the Foundations Boutique Compact Folding Crib, the Foundations Serenity Compact Crib, and the Foundations Pinnacle Steel Folding Crib. The Foundations Infapure 2-inch Mattress dimensions are as follows: ‎38 x 24 x 2 inches. The Foundations Infapure 3-inch Mattress are as follows: ‎38 x 24 x 3 inches. The Foundations Infapure 4-inch Mattress are as follows: ‎38 x 24 x 4 inches.