Serta Perfect Sleeper X Knox Hybrid Mattress
Best firm hybrid for hot sleepers needing targeted spinal support.
A firm hybrid option that prioritizes spinal alignment through targeted support zones. It balances the responsiveness of traditional coils with modern cooling tech to keep the sleep surface comfortable and stable.
$999.00
at
Raymour & Flanigan
More Perfect Sleeper options
Who it's for
- Couples wanting full surface utility and edge support
- Back and stomach sleepers needing optimal spinal alignment
- Sleepers seeking responsive support and pressure relief
Who should skip it
- Side sleepers requiring softer contouring for pressure points
- Hot sleepers sensitive to dense foam heat retention
- People who struggle moving heavy, bulky furniture
Performance breakdown
Spinal Alignment
Zoned coil system provides exceptional support for neutral spine positioning.
Temperature Regulation
Graphite-infused foam and cooling cover actively dissipate heat throughout the night.
Motion Isolation
Hybrid construction effectively dampens movement, though some transfer remains noticeable.
Pressure Relief
Memory foam layers contour well to alleviate stress on hips and shoulders.
Edge Support
Reinforced perimeter maintains stability, preventing that rolling-off-the-bed sensation.
Versatility
Robust hybrid build pairs perfectly with adjustable bases for customized comfort.
Key Specs
Firmness Level
Firm
Mattress Type
Hybrid
Thickness
13.5 inches
Comfort Layer
Memory Foam, Gel Foam
Motion Isolation Level
Good
Adjustable Base Compatible
Yes
Sleep Position Suitability
Back Sleepers, Stomach Sleepers
Warranty
10 Years
Cooling Technology
Gel Infused, Cooling Fabric Cover
Certifications
CertiPUR-US
What Reviewers Say
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