My husband and I have been on a quest to find comfortable support and spent hundreds of dollars on the effort. We recently purchased a very firm mattress for our California King bed. While it has helped to relieve much of our "middle-aged" aches and pains, it was REALLY firm. Adding the Enviro Green Memory Foam Mattress Topper provided just the right amount of "give". My only disappointment is that it is not an exact fit and doesn't quite reach from the top to the foot of the bed. The price was absolutely the best I found for this product!