This 4" memory foam mattress topper conforms to your body to give you pressure relief, so you don't have to toss and turn as much to get comfortable. It has built-in motion isolation, so it's designed to keep you asleep even if your partner tosses and turns. This topper has a medium firmness — making this great for a lot of people but it's best for back sleepers. Best of all, its ventilated, open cell design creates increased airflow to keep you from overheating while asleep. This mattress topper is also backed by a three-year warranty.