TOP RATED SAFETY: GREENGUARD GOLD Air Quality Certified for over 10,000 chemicals and VOCs known to pollute indoor air. ASTM and CPSIA Certified. Even passes state regulations for Chemicals of High Concern to Children for added safety and indoor emissions 2-STAGE HYBRID DESIGN: The best support from strong American-made steel coils plus cool gel foam comfort for enhanced sleep quality. Naturaly enhanced foam is tested to be cooler than regular foam. Grow-with-me dual firmness for infants and toddlers AMERICAN-MADE PREMIUM POSTURE SUPPORT: Extra firm and durable 204 steel innerspring coils that respond to baby's movement. Coil crib mattresses are tested to more standards than foam crib mattresses and offer gentleness and resiliency to support children UPGRADED SUPPORT SYSTEM: Full steel frame keeps the edges secure. EverEdge guards protect the corners and sides. Square corners fit snugly in any full-size crib. Light, airy, sustainable layering, natural cotton and cool gel is best-in-class in comfort MADE IN USA, PERFECT FIT: Passes ASTM crib mattress standards, fits all US standard size cribs AND toddler beds, measures 52"Lx28"W x 5.75" thick. Durable yet lightweight enough to flip or change sheets. Lifetime warranty. No toxic fire retardants CERTIPUR-US CERTIFIED FOAM: Analyzed and certified foam helps ensure quality and durability. Made without ozone depleters, no harsh fire retardants, no formaldehyde, mercury, lead, or other heavy metals. Feel good foam for a baby mattress you can trust