Heat-tempered Encased Coils Retain their Original Shape for Long Life.
The really great part of this futon mattress is the 8″ encased coil innerspring unit. Comprised of hundreds of individually wrapped, heat-tempered carbon steel coils, each acting independently to eliminate motion transfer while providing exceptional comfort. Two 2″ pieces of super soft foam and then wrapped in the exclusive JOY® natural cotton batting. All together equals a plush sofa-like feel with healthful nighttime support. All foam in this product is CertiPUR Certified. The heavy cotton twill outer cover shell is constructed like a box–with top for extra resiliency.