RightTemp Wave Foam, introduced with the Harmony Lux collection, uses carbon fiber to help regulate body temperature and is channeled for better airflow, for more comfortably cool sleep.

Previously found only in the ultra premium Beautyrest Black collection, Micro Diamond Memory Foam is used in the Diamond. A top of the line comfort material, it provides outstanding pressure relief, which helps you sleep soundly, and it uses diamond particles as a conductor, helping you sleep cooler. It works very well with the Right Temp Wave Foam which uses carbon fiber to reduce heat.

The Diamond features a best in class coil system, the T2 Pocketed Coil Technology, which uses two coils woven together to provide extra support to the lower back area. An individually wrapped system, it contours to your body, but it's made of high carbon steel so it's incredibly durable and supportive. This system represents a significant jump forward in mattress technology, and is also adjustable base friendly.

All of the Beautyrest Harmony Lux mattresses feature a quilt made with Seaqual's fabric technology. Seaqual is an ocean cleanup leader that takes plastics they've recovered from the oceans and transforms them into premium sustainable fabrics. These quilts feel soft, have a nice look, and promote a healthier, cleaner planet.

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

Beautyrest's Harmony Lux Diamond Medium Pillow Top is one of the best among firm pillow tops with its innovative and solid support system and generous layers of premium comfort materials. It's a wonderful option if you like a firm, yet conforming feel.