Rock Express 12" Tight Top Extra Firm Mattress by Diamond

  Performance Moisture Wicking Fabric.   Certipur Extra-Firm HD Comfort Layers   Diamond-made Dynamic Edge Wrapped Coils.   High Density Foam Layers for Firm Support   The mattress features a Verti-Coil spring system, which provides a sturdy and supportive foundation.   Traditional Classic Feel.   Recommended for back sleepers and stomach sleepers who enjoy a superior firmer feel.   Extra-Firm-Eco-Flex™ Support Foam.   20-year non-prorated warranty.   120–Night Mattress Trial  - To make sure it’s the right fit for you.