Choose Serta's SleepTrue Sparkling Sky 5-inch Crib and Toddler Mattress for your baby's standard size crib or toddler bed. Its thermo-bonded fiber core offers the long-lasting firmness and durability that's essential to baby's safety and growth, while its lightweight construction makes it incredibly easy for you to change the sheets. Built to ensure a snug fit inside the crib or toddler bed, this baby mattress is finished with square corners, so you can rest easy knowing it's the perfect fit for your baby's bed. Topped with a waterproof vinyl cover, Serta's SleepTrue Sparkling Sky 5-Inch Crib and Toddler Mattress will help keep baby dry and comfortable, night after night, year after year. This SleepTrue Mattress from Serta is GREENGUARD Certified for your child's safety and your peace of mind, it also meets Federal flammability standards and includes a 5 year limited warranty. Designed by the same brand that's been leading the way in mattress innovation and technology for more than 80 years, Serta's SleepTrue crib and toddler mattresses deliver comfort you (and your baby!) can believe in.