Beautyrest Black Series One Extra Firm Split King Mattress Set with Head Up Only Base

The "Extra Firm" designation in the Beautyrest Black Series One is achieved through the use of high-density, firm-feel comfort foam. While standard firm mattresses offer a balance of give and support, this specialty top type is designed for those who require a very stable, rigid sleep surface with minimal sinkage. This is often preferred by back sleepers or individuals who require maximum spinal alignment support.

This mattress is engineered with a multi-layered cooling system to manage heat throughout the night. It utilizes specialized vertical fibers paired with an applied surface-cooling technology that actively transfers heat away from the body. To further enhance breathability, the mattress features a unique channeled design that promotes consistent airflow, preventing the heat "trapping" often associated with high-density foams.

Yes, this configuration provides the ultimate solution for motion isolation. Because the split king consists of two independent Twin XL mattresses, physical movement on one side is not transferred to the other. Furthermore, the Beautyrest Black Series One utilizes Triple-Stranded Pocketed Coil Technology—our most advanced support system—designed specifically to absorb movement and provide individualized support so both sleepers can remain undisturbed.

We understand that adjusting to a new level of support takes time. Based on our 90-night Mattress Sleep Trial, we require an initial 30-night adjustment period to allow your body to acclimate to the specialized high-density foams. If you are not satisfied after that period, you have the option for a one-time exchange between day 30 and day 90 of delivery to ensure you find the perfect comfort level for your needs.

You can rest easy knowing that all foams used in this mattress are CertiPUR-US certified. This means they are manufactured without ozone depleters, PBDEs, TDCPP, or TCEP (“Tris”) flame retardants, and have been tested for low VOC emissions to ensure indoor air quality. Additionally, these mattresses are proudly assembled in the USA, adhering to high manufacturing standards.

A split king is an excellent choice for homes with challenging access points, such as urban apartments or older houses with narrow stairwells. Since the set is comprised of two separate Twin XL mattresses and two adjustable base components, it is much easier to maneuver through tight corners and doorways than a traditional one-piece king mattress.

This set features the RTG Sleep 2900 adjustable base, which allows you to conveniently raise the head of the mattress using a wireless remote. Elevating the torso is a proven method to help open airways, which can significantly reduce snoring. Additionally, this "Head Up Only" functionality is highly effective for sleepers seeking relief from acid reflux or those who enjoy reading and watching television in bed without straining their neck.