Serta New Dawn Deluxe Crib and Toddler Mattress: Extra-firm high-density thermo-bonded polyester fiber core Light weight for easy changing Square corners help for secure fit inside crib Durable, laminated vinyl cover on the infant side Woven fabric on toddler side that is water- and stain-resistant and has medical-grade waterproof backing on the toddler sideGREENGUARD Gold certified; recognizes products with low chemical emissions, contributing to healthier environments Meets or exceeds flammability, lead, phthalate and CPSIA testing and does not contain toxic fire retardants Limited 15-year warranty Dimensions: 52" x 27.5" x Beds sold separately. See our assortment of beds. Bed frames sold separately. See our assortment of bed frames. Great for platform beds. Requires foundation or box spring with standard bed frames. Foundations sold separately. See our assortment of foundations.