Instantly improve firm mattress - As you lie down, the top layer of memory foam will cradle your body along the curves, eliminating pressure points and enhancing the overall sleep climate for your better sleep. Green tea, the calming herb -- The memory foam mattress topper cal king is infused with Green Tea Extract, known to contain agents that help reduce stress and promote restful sleep. Because it's not about how long you sleep, but how well you sleep that matters-- It features 2 or 3 inches in the height for different softness, the thicker the softer. Just select the height to suit your preferred level of comfort.