Very heavy duty. It comes fully assembled (yay).  I’ve seen some toppers that are just the edge rim. This is a full box with a base. It is heavy enough to just lay on the dresser - I haven’t attached it yet to my furniture since it’s quite heavy and my baby is a newborn. But I will have to attach it soon before he gets too wiggly. The compartment on the side is great to keep supplies in place so they don’t slide off or get kicked off by the little one. The color is a true white.