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4.8 | 64 Reviews

Perfect Sleeper X Knox 13.5" Hybrid Firm Mattress -Queen

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: 13.5"
  • Height: 60"
  • Depth: 80"

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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
  • Firm - Ideal for stomach and back sleepers with extra support
  • 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 198167021386
Computed Mattress Size Queen
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 Firm HD Foam
Layer 1 Thickness (in) 1
Layer 2 Material PillowSoft Aire
Layer 2 Thickness (in) 1
Layer 3 Material Cool Twist Gel Foam
Layer 3 Thickness (in) 0.5
Layer 4 Material PerfectConform Graphite Memory Foam
Layer 4 Thickness (in) 1
Layer 5 Material Serta Support Foam
Layer 5 Thickness (in) 1
Layer 6 Material 5 ZoneActive Hybrid Design
Layer 6 Thickness (in) 8
Layer 7 Material Support Foam
Layer 7 Thickness (in) 1
Base Layer Material 5 ZoneActive Coil Unit
Product Depth (in) 79.5
Product Height (in) 13.5
Product Width (in) 60
Shipping Depth (in) 80
Shipping Height (in) 14
Shipping Width (in) 60.5
Product Weight (lb) 96.6,
Shipping Weight (lb) 59
Adjustable Base Compatible? Yes
Antimicrobial? Yes
Breathable Construction? Yes
Coil Count 768
Coil Density 1003
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 Firm
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 40.75
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: 13.5"
  • Height: 60"
  • Depth: 80"
Poster Image

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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.

4.8 out of 5

96% of reviewers recommend this product.

4 Stars

Comfy firm supportive

Elizabeth G 3/10/2025

Comfy firm good price
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

SATISFIED

Patricia N 3/9/2025

Perfect Sleeper. We're able to sleep at night. Very satisfied with with our back problems. Problem satisfied, very firm comfortable.❤️👌
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great mattress

Raymond b N 3/9/2025

Very supportive mattress. A restful night sleep.
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

P

Lavettra C 3/3/2025

Comfy and supportive mattress; it sleeps very well. It's also very heavy.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Love our new bed!

Kevin C 3/1/2025

Woke up with my back feeling better than it has in years!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Mattress

Marilyn S 2/27/2025

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Serta King Knox

Deborah S 2/24/2025

Enjoying this new mattress!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

cozy

James H 2/24/2025

good support and comfortable
Originally posted on www.serta.com

Yes, I 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

New Mattress

Janice G 2/21/2025

Comfortable and supportive mattress
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Sleep heaven

Susan D 2/21/2025

This mattress is so comfortable! It's firm but not too firm. I added my own pillow top and it feels like sleeping on a cloud. I'm a back sleeper and feel like this mattress has improved my sleep quality.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Love it

Marjorie P 2/20/2025

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Mimi's Bed

Margy P 2/20/2025

Delivery Team did a great job. Positive first impression!
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Full mattress

Kathleen B 2/18/2025

Feels good
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

Best Sleep Ever

Guillermo Z 2/12/2025

We got a new mattress and after much deliberation, went with a Serta. We have no more back or hip pain when we wake up in the morning, it has great support, and I haven't slept this great in years. Another thing that impressed me was the attention to aesthetics; the embroidered flowers on the mattress top are lovely. Thank you Serta!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

firm mattress

Antonino B 2/10/2025

Comfortable sleep
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Looks Great

Arthur E 2/10/2025

Feels good so far
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Excellent Deal

Emory K 2/7/2025

Absolutely love this mattress great for my back
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Comfy, supportive, great quality

Patricia Z 1/31/2025

Our new Serta mattress and box springs are very comfortable and supportive (for my bad back). This mattress is very well made.
Originally posted on www.serta.com

Yes, I 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

5 Stars

Comfy Cozy

redqueen193_9060 1/28/2025

This is a great mattress. It's tall, so if you have a tall frame you might want to get a new one. I love it. It's comfortable. I do think it could use a little more support but I love it.
Originally posted on www.serta.com

Yes, I recommend this product

 Incentivized Review

5 Stars

Very comfortable so far

Brian K 1/25/2025

Very comfortable so far
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

New bed

Deborah M 1/18/2025

Very comfortable.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

New dreams

Hyacinth M 1/16/2025

Very supportive thick mattress.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Sleepless in Chicago

Sam M 1/14/2025

So far so good. Takes some adjustment. Last night was great.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

New Serta Mattress

Joanna W 1/9/2025

Comfy and supportive - looking forward to many restful sleep nights.
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

So far, so good

Carolee R 1/8/2025

Sleep quality has improved
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Comfy

Aida V 1/6/2025

I hope se will sleep well.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Amazing comfort

Luis G 1/3/2025

What a nice mattress
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

Perfect firm and quality

Brian V 12/30/2024

Mattress exceeded expectations, firm and great construction.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

So far so good

Scott M 12/14/2024

Have had one night only so far and we are very pleased. Slept very well! Just the right level of firmness for us.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great!!

Rebecca C 12/13/2024

Comfy and supportive
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

New mattress

Cleveland G 12/4/2024

Comfortable and perfectly firm
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great

James C 12/4/2024

The first firm mattress we have had,it's really great
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Just great!

Stefanie C 12/3/2024

Finally a great bed !
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Mattress comfort

Lynn P 11/23/2024

Excellent so far and comfy.
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

After only 1 night , it's hard to think of a title

Andrew M 11/22/2024

Only had it 1 night and so far so good.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

After 1 night - good sleep

Amaury josue A 11/19/2024

Supportive in my back, comfortable when sleeping in the side, sturdy material.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Mattress from Scaff perfect sleeper X

Mark P 11/19/2024

Originally posted on www.serta.com

Yes, I recommend this product

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

Truly the perfect sleeper!

Rose M 11/15/2024

Love the firmness of this mattress. I'm a stomach sleeper and this provides me with the perfect amount of support for a great nights sleep. Also great for my husband who is a back sleeper. No more aches and pains upon wakening.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Big bed, extra supportive

Nicholas S 11/15/2024

Large bed, supportive mattress, taking a bit of time getting used to it. Too soon to say.
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Great mattress

Tikki S 11/9/2024

I haven't had great sleep in a long time, this mattress has changed that.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Finally; no pain

Connie D 11/3/2024

Was having severe back; hip and shoulder pain. Slept on another bed on vacation and realized I needed to get a new mattress!! It's amazing how much better I feel!!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

grnlight

Sonja G 11/3/2024

This mattress is firm and supportive exact comfort for me with a touch of softness like a pillow top. I just love it.
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