The request for a premium firm supportive mattress at an affordable price—delivered. As our single firmest mattress, the Riverside features a 600 offset coil innerspring unit and high density comfort layers. Our unique combination of a firm base, a high-density center, and a supportive foam top layer brings the quality of a finer hotel bed directly into your home. Now, you can enjoy the same great sleep every night as you may have previously experienced on vacation.