Beautyrest Black Split California King High Profile Foundation Pair (2 Twxl)
Will It Fit?
SKU: 5923780P
Discover Beautyrest Black®
Triple-Stranded Pocketed Coil® Technology offers our most advanced, individualized support + motion separation for every sleeping position.
Ventilated, Self-Response™ Latex®, designed to maximize airflow while conforming to your body for responsive pressure relief, combines with contouring memory foams and premium materials to provide luxurious comfort. *Available in select models
Sleep Climate™ Technology works with Micro Diamonds™ Memory Foam, a premium foam infused with diamond particles that is designed to help transfer heat away from the body, for an optimal sleep. *Available in select models
Specifically designed to work together with your Beautyrest Black mattress, this foundation offers long-lasting support and reduced motion for restful night's sleep. Includes 2 foundation pieces for split California king mattresses.
Collection
Box Spring
Warranty
10 year limited warranty -
View WarrantyColor
Gray
Pieces
2 pieces
Profile height
High profile
Split
Split
Upholstery material
Upholstery
Q&A answers generated with AI assistance.
Does this mattress foundation require assembly upon delivery?
This foundation pair is designed for ease of setup. Because it arrives as two pre-built split pieces, there is no complex assembly required. Our professional delivery teams can simply place the two Twin XL pieces into your existing California king frame, creating a seamless and sturdy support system for your mattress.
How does the height of this mattress foundation affect the look and feel of my bed?
This is a high-profile foundation with a 9-inch height. When paired with a standard mattress, it creates a traditional bed height that makes a significant aesthetic statement in larger master bedrooms. From a functional standpoint, a high-profile base is often preferred by those who find it easier to get in and out of a bed that sits higher off the floor.
Can I use this foundation on a standard king-sized bed frame?
No, this foundation is specifically sized for a California king bed, measuring 72 inches wide by 84 inches long. A standard king is wider (76 inches) and shorter (80 inches). To ensure a proper fit and adequate support, this foundation must be used with a California king-sized frame and mattress.
Is this mattress foundation compatible with any brand of mattress?
While specifically engineered to provide optimal support for Beautyrest Black mattresses and reduce motion transfer for a more restful sleep, this foundation's flat, upholstered surface is compatible with most standard California king mattresses. Always verify that your mattress manufacturer recommends a solid-surface foundation to ensure proper longevity.
I live in an apartment with a narrow staircase; will this California king mattress foundation fit?
Yes, this specific foundation is an ideal solution for urban dwellers or homes with tight corridors and narrow staircases. It is a "split" design, meaning it arrives as two separate pieces (specifically 2 Twin XL components). This allows for much easier maneuvering through doorways and around sharp corners compared to a standard, single-piece California king base.
What is the difference between a mattress foundation and a traditional box spring?
Unlike a traditional box spring that contains flexible coils, this foundation is a rigid, non-yielding base designed to provide a stable and flat support surface. Modern mattresses—particularly premium hybrid and memory foam models like the Beautyrest Black—require this solid support to maintain their structural integrity, prevent sagging, and ensure you remain within the parameters of your mattress warranty.
72.00"w x 83.50"d x 9.00"h
