5-zone Gel Memory Foam Unique 5 Zone Design: The NapQueen gel topper for mattress features an innovative 5-zone design for maximum comfort, aligning with different body zones in order to ensure a restful and uninterrupted sleeping cycle. Full Body Support: Infused with cool gen in order to maintain an optimal body temperature, this twin size mattress topper creates an optimal sleeping environment, providing excellent support for your head and neck, shoulder, lower back and legs.