If your mattress is still relatively new but you feel like it's a little too firm, then a topper can be a solution for that. The complementary layers allow your shoulders to sink in better and you immediately feel the pressure relief once you lay on it. If your mattress shows signs of wear, such as a hollow, the topper is of no use. The topper would adapt to the base of the hollow and would not have enough support to solve this problem. In this case, we'd recommend replacing the mattress.