Top inside layer is Serta fireblocker, providing gentle sleeping and safety using exclusive material; Cotton blend top layer ensures extra comfort * Dual sided infant side provides a safe sleeping environment through a layer of ortho-insulator and a layer of organic cotton; Toddler side provides safe sleeping environment through, two layers of organic cotton * Flex mesh support prevents the loss of cushioning * Offers balanced support from full perimeter border wire for firm edges when baby is standing plus, 4 side flex clips and 4 corner supports for added firmness * Made in USA and offers lifetime warranty