Finally, the King-Sized Beautyrest Black Hybrid X Class Firm 14-Inch Mattress has BlackIce Hybrid Technology. The new Simmons Beautyrest Black Hybrid X-Class Firm mattress is a great choice if you are seeking a high quality firm mattress with exceptional support and comfort . The Right Call. Beautyrest Black Hybrid X-Class Firm Mattress. Corrections: Have an update or correction to our information about Beautyrest Black Hybrid X-Class Firm? Finally, the Queen-Sized Beautyrest Black Hybrid X Class Firm 14-Inch Mattress has BlackIce Hybrid Technology. In conclusion, the Queen-Sized Beautyrest Black Hybrid X Class Firm … Put simply, the King-Sized Beautyrest Black Hybrid X Class Firm … This technology creates a cool-to-the-touch sensation at the surface of your mattress. Beautyrest Black Hybrid Collection. Beautyrest Black Hybrid Model Name: X-Class Firm Additional Information X-Class Firm Description: The X-Class Firm is a tight top spring core firm mattress model that is part of the Beautyrest product line manufactured by Beautyrest. A Great Call. The BlackICE Hybrid … The 13.5" Beautyrest Black Hybrid X-Class Firm mattress has 1.5" HD MemoryFoam, 1" Firm ComfortFoam, and 1.5" Self Response™ Latex pressure relieving foams that provide a firm … This collection only has four mattresses in the X-Class. This technology creates a cool-to-the-touch sensation at the surface of your mattress. It features the triple stranded T3 Advanced coil design which is the most durable in the industry. The Beautyrest Black Hybrid collection keeps the cooling properties of the black mattresses, but adds extra pressure relief, great for those with hip pain, back pain, or plain ole side sleepers.