The 8” Memory Foam mattress bundle is the best seller in 5 Little Monkey's specialty bedding line, designed for the growing needs of children and teenagers. The 5 Little Monkey Sleep system has created the ideal sleeping environment for your child. Our system includes a triple-layered mattress made using CertiPUR-US® certified memory foam, a waterproof mattress protector, and a custom-fill pillow. For added protection and comfort, our waterproof mattress protector is made with soft jersey knit and comes alongside a custom-filled pillow, which is anatomically correct for smaller bodies.