Sometimes the only thing you need you need to make a good mattress a great mattress is a topper. All of these well-reviewed Pure Green mattress toppers are discounted around 20% today. They’re available in 1", 2", and 3" thicknesses, so you can fully customize the firmness of your mattress.
The company recommends the 1" for a subtle change and to even out the surface of your mattress, whereas the 3" will overhaul older mattresses. Whatever your mattress needs, head over to Amazon and find the right size and thickness.