A SUPER firm sleeping surface ensures restful sleep for your little bundle of joy. The Serta Tranquility Super Firm crib mattress features SUPER firm, balanced support throughout with heavy gauge coils, corner supports and full perimeter border wire. Features an easy-to-clean, specially treated, heavily laminated cover which provides anti-bacterial and anti-microbial protection. Cover adorned with an adorable Country Check pattern.Top inside layer is Serta Fireblocker, providing gentle sleeping and safety using exclusive material. Cotton blend top layer ensures extra comfort. Exceeds federal and state flammability standards (16 CFR part 1633). Additional support provided by an ortho-insulated and polyester fiber layers for a SUPER FIRM safe, sleeping surface. 6 Mattress vents to keep sleeping environment fresh with natural air circulation. Balanced support from full perimeter border wire as well as 4 corner supports for firm edges when baby is standing. Security of edges assured by heavy duty cloth binding with lock stitching. This is stronger than vinyl. Lock stitching prevents the entire binding from unraveling if any threads become loose. Mattress also fits toddler bed frames. Infant side is the one with the sheep and moon pictured Made in the USA 35 year warranty.