Firm polyurethane foam's ability to reduce sagging and soft spots is one of the reasons so many people are using it to get the best night's sleep. Now you can enjoy the benefits of a firmer sleep surface without having to buy a new mattress by adding this firm polyurethane foam mattress topper to your existing spring, latex, or even memory foam mattress. This topper will add comfort, increase the firmness and your quality of sleep from your mattress immediately. Four inches of conventional polyurethane foam used in this topper is specifically designed to enhance the feel of your current mattress, and also provides additional support in areas where your mattress may be dipping or sagging. The open cell urethane foam is also specially formulated to help support the contours of your body, and will give you the extra support you need to get the best night's sleep possible from your current mattress. Environmentally friendly processes are used to make our foam. This makes our toppers more "green" and eco-friendly, by the use of earth friendly processes. Our toppers have also earned the PURGreen certification, which means they are safe and free from harmful chemicals. PURGreen uses independent laboratories to test products and ensure they are manufactured without use of prohibited content such as ozone-depleting CFCs, PBDE fire retardants, lead, mercury and other unsafe materials. PURGreen also sets baseline requirements for foam physical performance that can contribute to foam comfort and durability.***There may be a new foam smell associated with your new topper; however, this odor is not toxic or harmful passing all EPA and CSPC standards. MADE IN THE USA