Serta Perfect Sleeper X Quilted Hybrid Level 1 Knox Plush
GoodBed Expert Review
Our Take on Serta Perfect Sleeper X Quilted Hybrid Level 1 Knox Plush

Founder of GoodBed, Leading Mattress Expert
- Want a soft mattress
- Are either a side or back sleeper
- Are very easily disturbed by other movements in the bed (motion isolation is exceptional)
- Often sit or sleep along the edge of your bed (edge support is very good)
- Enjoy sleeping just a bit more 'in' your mattress than 'on' it
- Like a little bounce in your mattress, but not much
- Are a stomach sleeper, especially if you weigh more than 250 lb
- Want a natural or organic mattress (though this mattress is still OK in terms of avoiding harmful chemicals)
Serta Perfect Sleeper X Overview
GoodBed Editorial
The Perfect Sleeper X Collection adds new memory foam and a new five-zone coil unit. Is it right for you?
See our full reviewMaterials & Construction
Cover | 2.25″ quilted cover (w/ "PerfectPure Fiber and CoolFeel Technology") |
---|---|
Comfort Layers | 1.5″ poly foam ("CushionGel Foam") |
Transition Layers | 1″ memory foam ("Perfect Conform Graphite Memory Foam") |
Support Layers |
|
Total Thickness | 13.75'' |
Compare These Products
Serta Perfect Sleeper X Quilted Hybrid Level 1 Knox Plush vs. Other Beds
Compare the Serta Perfect Sleeper X Quilted Hybrid Level 1 Knox Plush mattress side by side with other Serta models, or with mattresses from other brands.
Where to Buy
Serta Perfect Sleeper X Quilted Hybrid Level 1 Knox Plush

Serta Online Seller
- Free delivery
- Return policy
- Financing available
Frequently Asked Questions
Serta Perfect Sleeper X Quilted Hybrid Level 1 Knox Plush
-
In our evaluation of the Serta Perfect Sleeper X Quilted Hybrid Level 1 Knox Plush mattress, we found it to be a Soft (7) on the GoodBed rating scale (1= firmest, 9 = softest).
-
-
Yes, the Serta Perfect Sleeper X Quilted Hybrid Level 1 Knox Plush mattress is adjustable base compatible. This means it is designed to be used on an adjustable base without incurring damage or voiding the warranty. In our review of this mattress, we tested it on an adjustable base to look for any adverse effects as the head and foot are elevated, and to see how well it conforms to the contours of the base both with and without the weight of a sleeper. Overall, we found the Knox Plush to have good adjustable base compatibility.
-
- Length: 10-year warranty.
- Indentation coverage: 1.5" and deeper.
- Proration: 10 years of full ("non-prorated") replacement coverage.
-
Here are the in-home trial details for mattresses purchased from the Serta website:
- Policy: Comfort Guarantee -- Mattresses can be returned for refund (after 30 day minimum trial).
- Fees: A 15% return fee + $200 for return shipping is deducted from the amount credited for returns.
- Notes: The iComfort/iSeries In-Home Trial Period is 120 nights. For other products, Serta's Comfort Assurance program is 45 nights.
-
Here are the delivery terms for mattresses purchased from the Serta website:
- Policy: Delivery available - Free with any mattress purchase
- Set-up: Set-up provided free with delivery
- Removal: Removal of old mattress provided free with delivery
- Notes: Free “white glove” (2-person) delivery to your bedroom. Includes unpacking and set-up as well as removal of packaging and old bedding if needed.
Expert Q&A
See questions from other mattress buyersOther Models from Serta
Additional Information
General Description
(Product description from Serta)
A plush-feel supportive 13.75” quilted mattress with a layer of 5 zoned coils for full-body spinal alignment, plus graphite-infused memory foams for xtra comfort.
Materials & Construction
- Our 5 ZoneActive™ Design combines coils and contouring memory foam for full-body alignment designed to offer comfort and support where you need it most.
- Experience targeted pressure relief with Perfect Conform™ Memory Foam that contours and cradles your pressure points for restorative sleep.
- Sleep comfortably throughout the night with cooling technology and 1” of graphite-infused memory foam that redistributes heat away from your body.
- 100% USA Assembled
- Law Label Lookup Model Number: 500100092
Responsibly crafted
- CertiPUR-US® Certified means our foam was tested for and is free from harmful chemicals and gasses
Compatibility
- Compatible with most frames, including: traditional frames, box springs, platform frames, slatted frames, bunky boards, and adjustable frames.
Warranty
- Length: 10-year warranty.
- Indentation coverage: 1.5" and deeper.
- Proration: 10 years of full ("non-prorated") replacement coverage.
About This Model
Status | Active (released 2024) |
---|---|
Manufacturer | Serta |
Line | Serta Perfect Sleeper X |
Collection | Serta Perfect Sleeper X Quilted Hybrid Level 1 |
Comfort Level | Soft |
Surface Type | Tight Top |
Support Type | Innerspring |
Build Details |
|
Corrections
Have an update or correction to our information about Serta Perfect Sleeper X Quilted Hybrid Level 1 Knox Plush? If so, please take a moment to suggest an edit.