The Harmony Firm Crib mattress is perfect for babies to toddlers. This two sided crib mattress is clearly labeled with infant and toddler sides, each delivers proper support for each age range. The core of the mattress features supportive soy enhanced foam. The toddler side is designed to regulate temperature, with the EverCool Gfx Memory Foam, while providing support and comfort to your toddler. Serta's iComfort Harmony Firm Foam Crib Mattress was designed with the same quality craftsmanship and attention to detail that is used when making adult mattresses. Plus, all Serta crib mattresses meet the strictest standards offered by GREENGUARD, and Gold Certified. Covered with a water and stain resistant soft knit fabric cover, to whisk heat away from your child's body and provide a breathable crib mattress.