FIRM SUPPORT, PLUS MORE - Our firmest mattress ever is engineered with heavier gauge steel independent pocket innersprings for added stability and extra firmness, ideal for stomach sleepers and plus-sized individuals SUPPORTIVE FOAM & POCKET SPRINGS - Soft comfort foam, durable high-density foam and motion-isolating independent pocket springs with a quilted jacquard cover offer a firm feel that’s perfect for stomach sleepers and those who enjoy a very firm mattress CERTIPUR US CERTIFIED - Highest quality foam is CertiPUR-US Certified for durability, performance, and content