Serta s Perfect Sleeper Cheery Days Crib and Toddler Mattress combines interlocking coils and memory foam to create the perfect hybrid of comfort and durability for your little one. At the core of this baby mattress 220 interlocking coils provide super-firm balanced support throughout the whole mattress. Two distinct sides deliver targeted comfort for newborns and toddlers. The infant side is the ideal firmness level for newborns and the toddler side features a layer of memory foam for enhanced comfort. A waterproof vinyl cover ensures easy cleanup. The Serta Perfect Sleeper Cheery Days Crib and Toddler Mattress is a great option for your baby?s crib or toddler bed. All Serta crib mattresses are GREENGUARD Gold Certified and meet the strictest standards offered by the GREENGUARD Environmental Institute which recognizes products with low chemical emissions contributing to improved indoor air quality.