The Sealy Baby Prestige Sleep Antibacterial 2-Stage Crib Mattress and Toddler Mattress is designed with health and safety in mind. The high 204 coil count is posture supportive and durability tested. The Ever Edge steel sides, corner and edge protectors keep the edges firm. An EPA-approved Staph-Gard antibacterial cover is lab-tested to help eliminate bacteria on baby's mattress surface. Must-have waterproof surface keeps liquids from seeping inside. Wipes clean with a damp cloth. Extra firm infant side and cozier toddler side for grow-with-me firmness. Tested to fit all standard size cribs and toddler beds. No harsh materials are used, does not contain any flame retardants. GREENGUARD GOLD Air Quality Certified for a healthier indoor environment. Passes ASTM crib mattress standards for durability and firmness. More babies sleep on award-winning Sealy than any other crib mattress brand. Lightweight to easily change crib sheets. Measures 51.63 x 27.25 x 5.75 inches. 20 year warranty on workmanship and materials.