Kid-friendly knitted fabric stretches in four directions, making the most of each comfort layer. Gel-infused quilted foam is soft to the touch, cradles the body, and helps keep the sleep surface cool. Active-Z's support layer offers medium firm upholstery foam, providing long lasting comfort throughout the mattress. Advanced support system offers individually wrapped coils that adapt to body movements and provide targeted support where it's needed most.Solid edge system delivers superior performance, additional sleep surface, and overall mattress stability with edge-to-edge foam encasement.