Firm and supportive, the Sealy Z-301 offers a restorative, replenishing sleep environment ideal for active, growing kids. Starting with the premium knit cover treated with AllergenProtect to defend against dust mite dander and other allergens, this firm mattress was designed with your child's health in mind. Beneath the cover, premium IsoMotion advanced gel infused memory foam conforms to each curve, relieving painful pressure points and cushioning growing bones. At the core of this supportive mattress is the Sealy Response Coil System, built to provide targeted deep down support and comfort. Reinforced by the SolidEdge HD System, this mattress allows your child to remain supported to the mattress edges. 10 Year Non-prorated Warranty.