Our iCoil system is made of hundreds of independent coils providing customized support for every inch of your body while minimizing motion transfer for uninterrupted sleep. A layer of super soft foam gives the added comfort of foam. The 8-inch spring mattress offers firm support keeping you aligned and pressure free for a great nights sleep. Order today and try it for yourself. 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. 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.