Comfort 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. The 8" spring mattress has a 7" iCoil base with a 1" high density foam layer on top to provide firm support and comfort. Environment Sleep Master embraces the idea of "Sleep Green", the comfort of your sleep environment is balanced with ingredients that 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 CertiPUR-US certified. You can rest ured 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 so back all our products with a limited 5-year warranty. Please leave a review and let us know about your experience with our products.