Comfort The memory foam topper is an easy way to prolong the life of your current mattress or to add an extra layer of comfort. This 4-inch topper gives you the body contouring comfort that you would get from the top layer of a memory foam mattress. Scent Memory foam mattresses are often associated with having a distinct odor. All our Sleep Master foam mattresses are infused with Evergreen and ActivCharcol. Evergreen is a green tea extract that naturally neutralizes odors from day one, while ActivCharcoal is made from purified charcoal that absorbs moisture minimizing odor-causing agents. Environment Sleep Master embraces the idea of "Sleep Green", the comfort of your sleep environment is balanced with ingredients that are safer for you and the environment. We use Bio Foam in all our mattresses, made with natural seed oil this minimizes the use of petrol based chemical oils. Additionally, all of our mattresses are CertiPUR-US certified. You can rest assured knowing that your mattress has gone through the most rigorous and comprehensive testing in the industry. Warranty We strive to help everyone experience a rejuvenating and relaxing night of sleep. We want you to love your mattress and back all our products with a limited 5-year warranty. Please leave a review and let us know about your experience with our products.