A great night’s sleep is as easy as “open, unroll, unwind” with the Serta Angel Whispers Dual Sided 5" Baby Crib Mattress and Toddler Mattress in a Box. Made with a soft, knit cover with waterproof backing and plant-based soy foam core, this baby mattress provides exceptional comfort as well as the ideal firmness level to support growth and development. Both sides of this mattress feature the waterproof backing, so all you need to do is flip the mattress when it comes time for your baby to move from the crib to a toddler bed—it’s specifically designed to fit any standard full-size crib and toddler bed. For optimal performance, open and unroll your mattress within 2 weeks of purchase. Once unpacked and fully expanded, zip the cover up. The cover is not intended to be removed and is not washable. Mattress may take up 48 hours to fully expand. A healthy and safe choice for your baby, all Serta crib mattresses are GREENGUARD Gold Certified.