The Carbon Medium Pillow Top gets it firm, yet comfortable feel from several layers of premium materials, but the new technology of the RightTemp Wave Foam is particularly interesting. It's made of carbon fiber, which conducts heat away from the surface, and has a channeled design that promotes better airflow, so you'll be kept cool all night.

Dynamic Response Memory Foam is a premium pressure relief material, which is essential for reducing tossing and turning. This layer is conforming, and shapes to your body, which promotes better circulation so you can get the highest quality of sleep.

This new coil system design, the T2 Coil System, involves extra rows of coils that are like two coils twisted together. This unique design provides better support to the lower back, where it's most necessary and provides very solid support. Since they're pocketed coils, this mattress has a conforming feel and can be used with an adjustable base.

Through their partnership with Seaqual, a leader in ocean cleanup technology, Beautyrest uses reclaimed plastic from the oceans in every quilt. Each Harmony Lux mattress features this sustainable and high-quality fabric that works towards cleaner oceans.

You'll get at least a decade of support and comfort out of this mattress, as shown by the 10 year non-prorated warranty.

Overall, I think the Carbon Medium Pillow Top is one of the best mattresses available today. Beautyrest has really stepped up their innovation, making Harmony Lux one of the best collections that's been released recently. For someone who wants a medium-firm feel, this is a superb option.