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4.6 | 35 Reviews

Perfect Sleeper X Knox 13.75" Hybrid Plush Mattress -California King

Perfect Sleeper X

Features

  • Our 5 ZoneResponse™ Design combines coils and contouring memory foam for full body spinal alignment
  • Our PerfectConform™ Memory Foam contours and cradles your pressure points for rejuvenating sleep
  • CoolFeel™ System - Cooling technology keeps you comfortable throughout the night
  • CertiPUR-US® Certified

Quick Specs

  • Brand: SERTA
  • Line: Perfect Sleeper X
  • Type: Tight Top
  • Width: 13.75"
  • Height: 72"
  • Depth: 84"

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Experience premium support and perfect sleep with our new Serta® Quilted Perfect Sleeper X™ Collection. Our 5 ZoneResponse™ Design is comprised of Perfect Conform™ Memory Foam paired with 5-zoned coils for full-body alignment. Sleep comfortably cool throughout the night with cooling technology and graphite-infused memory foam designed to redistribute heat away from your body. A quilted top offers a classic feel and added layer of plush foam. Xtraordinary sleep is possible, with Serta® Quilted Perfect Sleeper X™.

Features

  • Our 5 ZoneResponse™ Design combines coils and contouring memory foam for full body spinal alignment
  • Our PerfectConform™ Memory Foam contours and cradles your pressure points for rejuvenating sleep
  • CoolFeel™ System - Cooling technology keeps you comfortable throughout the night
  • CertiPUR-US® Certified
  • Designed and Built in USA
  • Adjustable Friendly
  • 10 Year Warranty
  • Your new mattress may initially feel firmer than expected. Please allow up to 60 days to acclimate to your new mattress as it naturally adjusts to contour, comfort, and support you best
  • Plush - Great for side sleepers for extra comfort at the shoulders, hips and lower back
  • Premium memory foam is temperature-sensitive; it may feel firmer in cooler temperatures and softer in warmer ones. For your preferred comfort, please allow several hours for your memory foam mattress to adjust to the room's temperature
Brand Serta
Manufacturer Name Serta Simmons Bedding LLC
UPC 198167021355
Computed Mattress Size Cal King
Country of Manufacture USA
Assembled in USA? Yes
Computed Product Type One Sided Mattress
Product Category Mattress
Family Name ,
SubFamily Name Knox
Mattress Top Type Tight Top
Mattress Type Hybrid
Product Type Mattress
Year of Launch 2024
Dealer Line National Line
Layer 1 Material Serta PillowSoft HD Foam
Layer 1 Thickness (in) 1.25
Layer 2 Material PillowSoft Aire
Layer 2 Thickness (in) 1
Layer 3 Material Cushion Gel Foam
Layer 3 Thickness (in) 1.5
Layer 4 Material PerfectConform Graphite Memory Foam
Layer 4 Thickness (in) 1
Layer 5 Material 5 ZoneActive Hybrid Design
Layer 5 Thickness (in) 8
Layer 6 Material Support Foam
Layer 6 Thickness (in) 1
Base Layer Material 5 ZoneActive Coil Unit
Product Depth (in) 83.5
Product Height (in) 13.75
Product Width (in) 72
Shipping Depth (in) 72.5
Shipping Height (in) 14.25
Shipping Width (in) 84
Product Weight (lb) 124.03,
Shipping Weight (lb) 74
Adjustable Base Compatible? Yes
Antimicrobial? Yes
Breathable Construction? Yes
Coil Count 952
Coil Density 1203
Coil Type Pocketed Coil
Coil Gauge 0.068"/0.074"
Cooling Technology? Phase change material
Edge Support? Yes
Foam Infusion? Graphite
Handles Included? Yes
Is Mattress 2 Sided? No
Latex Free? Yes
Mattress Comfort Level Plush
Mattress Cover Design Floral
Mattress Cover Stitch Design Floral
Mattress In A Box? No
Moisture-Wicking? Yes
Pillow Top? No
Product Accent Color Light Blue
Product Cubes 52.07
Quilted Cover? Yes
Side Color Dark Blue
Top Cover Color Black
Zipper Cover Machine Washable? N/A
Zipper Cover? No
Product Warranty Length 10
Does it Ship in a box Yes

Quick Specs


  • Manufacturer

  • Brand: SERTA
  • Line: Perfect Sleeper X

  • Appearance

  • Type: Tight Top

  • Dimensions

  • Width: 13.75"
  • Height: 72"
  • Depth: 84"
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Professional delivery and installation is available for every product we sell. We would be happy to coordinate delivery and installation for you.

Extended warranties are usually very inexpensive and can save you thousands in the future. It's simple and inexpensive to purchase extended warranties and one of the smartest ways to protect your investment.

Mattresses can be large, heavy and expensive. You probably don't have the special tools or expertise needed to fix them in a crisis. If you can spare a few thousand dollars without batting an eyelash for new bedding should they break tomorrow, don't buy a warranty. But if you're like most of us, protect yourself by purchasing inexpensive extended warranties when you buy a new product and save yourself big money in the long run.

4.6 out of 5

91% of reviewers recommend this product.

5 Stars

Comfortable

Bryan F 3/14/2025

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Fantastic support!

Michelle S 3/9/2025

This mattress is so comfortable! Perfect amount of softness on the top to support my curves with great firm support beneath. I am just giddy to climb into bed each night. I don't know why I didn't buy a new mattress sooner. I had no idea what I was missing!
Originally posted on www.serta.com

Yes, I recommend this product

3 Stars

Doesn't feel like it did in the store

Wayman T 2/22/2025

Hoping it will soften soon
Originally posted on www.serta.com

No, I do not recommend this product

1 Stars

Bad quality

Mattori 2/22/2025

I just started sleeping on this mattress and it has a horrible bubble in the middle. This is the cool calming queen mattress. It's a replacement for a different mattress from serta and it only lasted 6 months before the sides started caving in. I will never buy a serta mattress again.
Originally posted on www.serta.com

No, I do not recommend this product

5 Stars

Comfortable!

Marcy M 2/17/2025

Definitely comfy!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Excellent!

Kimberly A 2/16/2025

Great first nights sleep!
Originally posted on www.serta.com

Yes, I recommend this product

1 Stars

What a nightmare

Wheresmymattress 2/13/2025

Hard to review a mattress when it has yet to arrive. Just the fact they asked me to review the mattress means they have no idea I don't have it yet. The Shipping company Serta uses lost the first mattress. Had to wait for Serta to manufacture another one. Now the delivery company keeps pushing delivery dates back on us. 2 months now
Originally posted on www.serta.com

No, I do not recommend this product

5 Stars

Emankcin 1/31/2025

Very comfortable mattress for me. Firm but not too firm. No more back ache.
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Getting use to it

Josefina P 1/21/2025

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

our mattress

Andrea D 1/20/2025

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Excellent mattress

David K 1/19/2025

Very comfortable and supportive. Provide a great nights sleep
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great

Patrick L 1/15/2025

So comfortable love it
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Supportive mattresse

CaseyAZ 1/1/2025

Have been sleeping on the mattress for about 3 weeks. Me and my partner like different firmnesses. I am a side sleepersnd they are side and back sleeper. We got the medium firm with a pillow top and it comfortable for both of us. JE
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

New Delivery

Maria G 12/23/2024

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

1 of 2

Ronald L 12/14/2024

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

beautiful

Ruth R 12/3/2024

comfy and supportive now all I need is to get my box spring that I had to reorder because the first one was damaged in shipment.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great mattress

Holli 11/23/2024

This mattress is amazing and a life saver. I did expect it to be more plush but it's still very comfortable. I sleep great now!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Have you ever wanted your bed to give you a hug?

kaifou_199126 11/20/2024

This bed was put into our guest room and it might be more comfortable than my bed. With the right mattress protector, the mattress is surprisingly cooling and cozy in both hot and cold weather! The mattress has the perfect balance of plushness and support for your body. I would recommend to anyone looking for a new mattress.
Originally posted on www.serta.com

Yes, I recommend this product

 Incentivized Review

5 Stars

Sturdy, yet soft like a pillow.

issacl1_336065 11/19/2024

The bed is incredibly comfortable. The top is soft like a pillow, but the whole mattress feels firm. The pattern on it is cool but doesn't really add anything to the performance of it. This is a perfect choice for back sleepers or those who sleep on their stomach. Amazing product with an amazing quality feel to it.
Originally posted on www.serta.com

Yes, I recommend this product

 Incentivized Review

5 Stars

LLFo 11/19/2024

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Seventies young 11/18/2024

We bought this matress about a month ago and have loved it. We are older and it has been very comfortable.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Bouncy firm;)

mikeinaples 11/3/2024

I traded a firm which was very soft- I'd guess medium at most, but the extra firm is perfect for those who prefer a firm bed.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Sleep Cool and Comfortable

photoginthewild 10/21/2024

I have spent a full month sleeping on this mattress. I love it! I am a bit of a princess and a pea when it comes to mattresses. Most importantly for me, I am a woman who wakes up hot in the middle of the night. Not sweaty but just hot, not in a snuggly way but an uncomfortable way. I have not had that issue at all with this mattress. It conforms and cradles your curves if you are a side sleeper and it is a very tall mattress which I like. For reference, my previous mattress was a tempurpedic so I was worried about it being too soft but while the top is thick and plus, it has plenty of support. Very pleased with this mattress!
Originally posted on www.serta.com

Yes, I recommend this product

 Incentivized Review

4 Stars

High quality good performance

ksr_official95 10/20/2024

This Matress has been really good with my back. It's comfortable and you get good sleep at night. The hybrid technology keeps my body cool and it's nice to feel firmness along with comfort.
Originally posted on www.serta.com

Yes, I recommend this product

 Incentivized Review

5 Stars

Good Mattress

cai313 10/19/2024

This bed is comfortable and not too big or small. It's not lumpy or flat. I get really good sleep with this mattress. It holds its shape, even when it's adjusting to my body. It's has a nice pattern on it and it doesn't leave me feeling too hot or cold.
Originally posted on www.serta.com

Yes, I recommend this product

 Incentivized Review

5 Stars

Comfortable

victoriar367 9/27/2024

ABSOLUTELY AMAZING! I can't believe I received a mattress, an extremely comfortable one at that! It adds so much to the room. The height is great & completes the room. The design on the mattress is very intricate. Good support, durability, and comfort. It's soft yet firm. Love this mattress!
Originally posted on www.serta.com

Yes, I recommend this product

 Incentivized Review

5 Stars

My son loves it

joelleli 9/26/2024

We put this serta mattress in my son's room and he loves sleeping in it. It's really comfortable for us as well for those nights he wants us sleeping with him. My husband and I don't wake with any back pain like we did with his old mattress. 10/10 would recommend
Originally posted on www.serta.com

Yes, I recommend this product

 Incentivized Review

5 Stars

Comfortable for side sleeping

victoriaaluu 9/26/2024

My husband and I have been sleeping on this mattress for 3 weeks. Prior to this, we had a queen size pillow top mattress from Crate and Barrel that is very soft. . There was no smell to the mattress when it arrived and we were able to use it right away. We are both side sleepers and noticed that this mattress is slightly firmer than our old one but molds to our body more than our old one, almost like memory foam. I can see it being comfortable for people who also sleep on their back. We have been sleeping on our sides with no problem and have been getting good rest. The mattress is much lighter than our old one and I think I'll be able to turn it on my own. Overall I have no complaints and we will continue to use this mattress in our primary bedroom.
Originally posted on www.serta.com

Yes, I recommend this product

 Incentivized Review

5 Stars

Best Night's Sleep

sarahhhwhite_ 9/22/2024

I was so excited to receive this mattress! This is the most comfortable bed that I have slept on. Everything from the cooling technology to the perfect balance of firmness to plush. I've never had any discomfort from sleeping and I am a side sleeper. I would recommend this mattress to anyone in the market for something new that has great cooling technology and molds perfectly to make a great nights sleep!
Originally posted on www.serta.com

Yes, I recommend this product

 Incentivized Review

5 Stars

Cooling technology

dennyl1 9/21/2024

After a month of sleeping on the **Serta Perfect Sleeper Quilted Hybrid 24 Knox Plush Tight Top (Queen)**, here are some impressions I have: ### Comfort and Support: - **Plush Feel with Firm Support**: The plush top provides a soft, welcoming surface, while the underlying firm support ensures proper spinal alignment. This combination is ideal for back and stomach sleepers who need solid support but still enjoy a softer surface for comfort - **Pressure Relief**: The memory foam and gel layers do a good job of relieving pressure from key areas such as the shoulders, hips, and lower back, which is particularly helpful if you're prone to waking up with aches ### Cooling Features: - **Cooling Tech**: One of the standout features is the **Cool Twist Gel Foam** and **graphite-infused memory foam**. These layers work well to dissipate body heat, keeping the mattress relatively cool even on warm nights. If you're a hot sleeper, you may notice an improvement in temperature regulation ### Motion Isolation: - **Minimized Partner Disturbance**: The mattress's coil and foam construction does a great job of isolating motion, so if you share your bed with someone, you're less likely to be disturbed by their movements during the night ### Adjustability and Durability: - **Early Durability Observations**: After a month, the mattress should still feel as firm and supportive as when it was first purchased. The **edge support** is strong, preventing sagging when sitting or lying near the edges. Additionally, it's compatible with adjustable bases, which adds flexibility for various sleeping positions ### Potential Downsides: - **Plush Might Be Too Soft for Some**: Although the plush top feels luxurious, some users might find it a bit too soft, especially if they prefer firmer surfaces or are heavier individuals, as they might experience more sinkage than they prefer Overall, after a month, this mattress should still feel new, with excellent support and comfort, making it a solid choice for those who value pressure relief, motion isolation, and cooling technology.
Originally posted on www.serta.com

Yes, I recommend this product

 Incentivized Review

5 Stars

Great support and breathability

bradh19 9/16/2024

This is an absolutely comfortable bed. Didn't know how our old bed was wore out until we felt the support this bed provides. We seem to sleep cool and it breathes well. Great packaging and should last a long time.
Originally posted on www.serta.com

Yes, I recommend this product

 Incentivized Review

5 Stars

Definitely LOVE!!!

bbyjayy 9/9/2024

At first I was skeptical to receive a mattress to review however I am truly blown away by the quality and comfortability! I went from total memory foam to this and it has truly made a different in the support on my back! I can also tell the different with their cooling technology! I feel blessed and extremely grateful for this opportunity!
Originally posted on www.serta.com

Yes, I recommend this product

 Incentivized Review

5 Stars

Supportive and so comfortable

girlchickbetty 9/8/2024

This is the most comfortable mattress that I've ever owned! I've bought all sorts of toppers in the past to try to make our old mattresses more comfortable but this one has been amazing straight from the box! It didn't need to air out and had zero off gassing smells. I usually feel unsupported on my lower back but this pillow top really fills out your curves and supports everywhere. The floral design is very cute, I do worry that it might pill but haven't had any issues yet.
Originally posted on www.serta.com

Yes, I recommend this product

 Incentivized Review

4 Stars

Such a comfy mattress

karalaurenbecker 9/8/2024

So excited to have a Serta mattress! This mattress is beyond beautiful and so stinking comfy. The quality of this mattress is unbeatable and you can tell it's a quality mattress just by looking at it. I love that this has a plush top but has enough firmness to keep you sleeping comfortably all night. I also love that it is a cooling mattress and doesn't make you to hot threw out the night. Super impressed with this mattress and can't wait to continue an amazing night sleep with this beautiful mattress.
Originally posted on www.serta.com

Yes, I recommend this product

 Incentivized Review

5 Stars

Best sleep I've had in a long time!

nestaziak 9/7/2024

This mattress is amazing! I didn't know how badly I needed a new mattress until I received this one. I had the best nights sleep ever, I woke up feeling refreshed and ready to go for my day! The mattress itself is so comfortable and has just the right amount of firmness. I also like the quilted material of the mattress and the height of it. It is definitely worth the price and I am so happy to have it.
Originally posted on www.serta.com

Yes, I recommend this product

 Incentivized Review