Firm Foam mattress fits play yards with specific square corners and dimensions of 37.5" X 25.5" X 3" . Not all play yards are created equal. Some are designed with square corners and others with rounded corners. This firm foam mattress has square corners and is manufactured with firm foam for added support to create an inviting, safe and comfortable environment to play and nap for your little one. This premium mattress is manufactured in the USA with quality materials and workmanship and is phthalate and lead free, has a hypoallergenic, anti-bacterial, waterproof cover that aids in the prevention of mold, mildew and odor. Easily wipes clean with mild soap and water. Meets Federal Standard Flammability Standard 16-CFR 1633. Dimensions: 37.5" X 25.5" X 3"