Kluft Royal Sovereign Knight II Extra Firm King Mattress Set
Best extra firm mattress for those prioritizing superior spinal alignment.
Discover exceptional comfort and support with the Kluft Royal Sovereign Knight II Extra Firm King Mattress Set. Engineered for optimal spinal alignment, this King-sized mattress offers a luxurious extra firm feel. It comes complete with a sleek, low-profile 6" box spring, providing a sophisticated foundation for your bedroom. Crafted with premium materials, this set promises enduring quality and a superior sleep experience. Elevate your rest with this elegantly designed and remarkably supportive mattress solution.
$10730.00
Owner Satisfaction
4.6
/ 5
Category Rank
265
/ 6148
#265 in Mattresses
Price vs Category Average
+545%
Above average
Size
King
/ King
Who it's for
- Luxury shoppers prioritizing premium natural materials and artisanal quality
- Back and stomach sleepers needing firm, stable spinal alignment
- Long-term investors seeking a mattress built for lasting durability
Who should skip it
- Side sleepers requiring soft pressure relief for hips and shoulders
- Individuals who struggle with heavy lifting or frequent mattress rotation
- Budget-conscious buyers seeking value over ultra-luxury branding
Performance breakdown
Spinal Alignment
Extra firm construction provides exceptional support for neutral spine positioning.
Build Quality
Premium materials ensure long-term durability and consistent surface tension.
Foundation Stability
The included low-profile box spring offers a sturdy, vibration-free base.
Surface Firmness
Delivers a rigid, unyielding feel ideal for back and stomach sleepers.
Aesthetic Design
Sophisticated tailoring makes this set a centerpiece for any bedroom.
Motion Isolation
Hybrid construction effectively dampens movement across the expansive king surface.
Key Specs
Size
King
Firmness
Extra Firm
Mattress Construction
Hybrid
Set includes
6" Box Spring
Model Number
9289715
SKU
9289715
Features
- Extra firm support for spinal alignment
- Luxurious King size sleeping space
- Includes low-profile 6" box spring
- Premium construction for lasting comfort
- Designed for a superior sleep experience
- Elegant and sophisticated design
What customers say
Owners express intense loyalty for the Kluft Royal Sovereign Knight II Extra Firm King Mattress Set, consistently praising its unparalleled build quality and meticulous craftsmanship. Many describe it as furniture, noting its robust, uncompromising support that precisely delivers on the extra firm designation. This mattress is highly valued for its superior materials and durability, maintaining integrity and support over many years. While the quality and durability are overwhelmingly positive, the extreme price point is a significant consideration. For some, the initial investment is justified by its longevity. However, the high cost can be prohibitive, and the extra firm feel is polarizing, delighting those who prefer rigid support but potentially causing discomfort for others expecting a softer surface.
Know before you buy
The extra firm rating indicates a very stable, supportive surface with minimal sinkage. It is designed for sleepers who prefer a rigid feel that keeps the body aligned rather than contouring deeply into the materials.
Yes, the mattress is designed to be paired with the included 6-inch box spring to ensure proper support and structural integrity. Using a different foundation may affect the mattress's performance and could potentially void your warranty.
The hybrid design combines the responsive support of traditional coil systems with premium comfort layers. This provides the durability and spinal alignment of a firm mattress while ensuring the materials remain resilient over time.
Because this model is extra firm, it is generally better suited for back or stomach sleepers who require significant support to prevent the hips from sinking. Side sleepers typically require more pressure relief in the shoulders and hips than an extra firm surface provides.
The set includes a 6-inch low-profile box spring. While the specific thickness of the mattress itself varies by model, the low-profile foundation is designed to keep the overall bed height manageable for easier entry and exit.
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$10730