New and just for kids, the X1 Edge mattress is built to last, with comfort and support for ages 4 and up. Innovative design features combined with our highly quality fabric technologies help kids get deeper, uninterrupted sleep at night for better health, focus and peak performance each day. A waterproof barrier beneath top cover protects mattress. Removable magic edge bumper guards against rolling. Boost-X® adaptive support and balanced comfort transitions easily from crib or toddler bed to "big kid” bed. This mattress promotes maximum air flow in and around the mattress for better temperature regulation.