The Sealy Serene Duo-Sleek 2-Stage Crib Mattress and Toddler Mattress is a grow-with-me dual firm baby mattress made from premium, sustainable fiber foam that is gentle on baby and the environment. Firmer infant side and cozier toddler side. Earth-friendlier, sustainable foam crib mattress is hypoallergenic and extra durable. 100% waterproof crib mattress. Reinforced pearlized cover is durable and tear-resistant, stain-resistant and odor-resistant. An airflow pocket helps baby's mattress to breathe without any small metal vents or leaky zippers. Infant mattress wipes clean with a damp cloth. Full standard size crib mattress measures 52 x 28 x 5.75 inches for a secure fit in all standard cribs and toddler beds. The square corner design offers a snug corner fit. Ultra-lightweight crib mattress weighs less than 8 pounds to easily change baby's crib sheets. Tested for firmness to help reduce risk of suffocation, and durability tested to perform comfortably through the toddler years! Sealy baby crib mattresses all meet ASTM Crib Mattress standards for safety, quality and lasting durability. GREENGUARD GOLD Air Quality Certified for a healthier indoor sleeping environment. Trusted brand and quality warranty for workmanship and materials. Parents have voted Sealy the most trusted mattress brand. Parents trust Sealy crib mattresses because they are tested to the highest safety and quality standards and Sealy is globally recognized as a premier brand in bedding for almost 140 years.