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4.7 | 221 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 Perfect Sleeper X
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"
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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.

4.7 out of 5

94% of reviewers recommend this product.

5 Stars

Perfect for me

Gretchen B 10/4/2026

This mattress is just what I needed. Firm yet comfortable. I can move around easily.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Love it!

Britt L 10/3/2026

I love the mattress! It's firm but not too firm and very thick!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Knox firm Queen

Michael O 10/2/2026

The 5 zones are nice.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Very comfortable

Anna C 9/28/2026

This mattress hugs you all night. It's wonderful.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Wonderful new mattress

Lorraine B 9/19/2026

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

Yes, I recommend this product

3 Stars

Good mattress

Nancy L 9/12/2026

I have only had this mattress since May and there's already dips in it from where my husband and I both lay and we're not big people.
Originally posted on www.serta.com

No, I do not recommend this product

5 Stars

my perfect mattress

Ken R 9/6/2026

best night sleep in a long time excellent
Originally posted on www.serta.com

Yes, I recommend this product

3 Stars

Unsure

Sandra B 8/31/2026

Much firmer than the model.
Originally posted on www.serta.com

No, I do not recommend this product

4 Stars

Comfortable mattress

Bryan D 8/28/2026

Very comfortable!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Quality and Comfort

Karen W 8/23/2026

Very comfortable and supportive mattress with cooling technology. Pleased with purchase at Gardner White!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Bed is firm and comfortable

Cheryl I 8/19/2026

Bed is firm and comfortable. Too firm for my husband but right for me
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Restful Sleep

Stanley L 8/5/2026

comfortable sleeping........remote is a bonus .........still finding our perfect setting for head and leg adjustment
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great!

Mike and peg K 7/27/2026

Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Very comfortable mattress

Joseph T 7/24/2026

Nice supportive mattress
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Name of bed

Emily F 7/15/2026

Ours is the Perfect Sleeper X Knox Quilted Hybrid 13.5 Quilted wasn't part of the drop down choice- not sure it matters. ?? We love it!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Comfy

Noel E 7/10/2026

Love the support and the foam is caressing!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great deal

John O 7/8/2026

Very very comfortable
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Serta

Linda C 6/29/2026

Foundation too high.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Raymour

Danielle J 6/28/2026

Bought mattress in Watertown Ny from Raymour and it feels amazing, firm just like we like it
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Mattress

Paul G 6/14/2026

Firm the way, I like it and very comfortable
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Sleepless Nights

Keith B 6/8/2026

My 4 star is more for great price for mattress. I've only had 3 nights of sleep with my new mattress and not able to give a true performance review for the comfort of the mattress. What I can give, I have not awaken during the night or next morning with total body soreness.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

So far so good!

Telisa S 6/7/2026

My first night sleeping on the mattress and it was night and day compared to my old mattress. I did not wake up in pain, specifically, low back pain. The difference after one night of sleep is profound. I pray this continues and does not change after a year. It seems that's when mattresses sleep quality change.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Nice firm mattress

Robert S 6/7/2026

Delivered 6/3/2026. Have enjoyed four nights sleep and we've gotten up refreshed. Looking forward to many more over the years ahead.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

New mattress.

Daetrell L 5/29/2026

Mattress is very comfortable and price worthy. I do heavy construction for a living so my body is saying thank you.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Supportive

Kim S 5/28/2026

Comfy and makes a pretty bed
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

New Mattress

Eleanor W 5/28/2026

It was comfortable in the store - we will see how it is at home
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Comfy

Kari C 5/21/2026

Mattress is comfy and supportive. If you like a firm mattress - this is the one for you.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

New Comfy Mattress

Anne R 5/19/2026

Love it! It is so comforting and relaxing…with lots of support!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Comfortable

Michael G 5/16/2026

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Commmmfortable

Cheryl P 5/16/2026

I have no complaints it's super comfortable. I never thought i'd like a mattress other than my king koil.
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Really great I enjoyed it

Subhashkumar P 5/13/2026

Great of restful sleep. Nice o can sleep on relax
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Nice

Olsi G 5/8/2026

Nice mattress
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Matress

Prince P 5/8/2026

Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

New Mattress After 14 Years

Karen R 5/3/2026

Comfortable and Affordable
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

New firmness

Shannon C 4/28/2026

Firm & supportive where I need it and still comfortable enough to sleep on my side..
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

comfortable

Arturo R 4/27/2026

excellent mattress very comfortable firm and soft
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great full size mattress!

Robert B 4/25/2026

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great mattress

Robert B 4/22/2026

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Super comfortable

Brian T 4/18/2026

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

First Night Restful

Joseph B 4/16/2026

I typically take days to adjust to a new mattress. The first night was very relaxing.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Knox firm

Bill H 4/14/2026

A few days in. So far so good. Needed firm mattress. Waking up without pain
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Had a full nites sleep!

Linda F 4/4/2026

Wanted firm. Got firm. Kept firm didnt sink in... I slept 12 hours straight instead of adjusting & waking up every 2 hours and woke up with zero aches & pains! Its night #4... im hoping it will last days weeks months & years to come ?
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Best Mattress Ever!

Jill M 4/1/2026

Firm, but not too firm, felt supported and blissful from the very first night...best sleep I've had in months!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Ashley Furniture

Sarah A 3/27/2026

Great firm mattress
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Nice mattress

Trent W 3/27/2026

Firm but not extra firm with some top foam. It's nice!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Excellent firm mattress

Alexander M 3/22/2026

Very supportive
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Perfect Sleeper

Cari T 3/21/2026

This mattress will be "perfect" as soon as my back adjusts to the firmness. I do like the comfiness of the top layer and the mattress is supportive.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Excellent mattress

Wayne W 3/21/2026

We like the mattress very much
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Firm

Lisa A 3/16/2026

Firm and supportive
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Nice firm mattress

Nicole R 3/16/2026

We replaced a failing mattress with this Serta Hybrid... it nicely firm and supportive, but not overly hard. It sits a little higher up than previous mattresses (maybe due to the matching foundation?) but my tall husband appreciates the extra height.
Originally posted on www.serta.com

Yes, I recommend this product