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4.6 | 1559 Reviews

Perfect Sleeper Cobalt Calm 12" Extra Firm Mattress -Queen

Perfect Sleeper

Features

  • Cool Twist® Gel Foam - Cooling gel is swirled directly into a breathable foam designed to promote airflow and heat dissipation.
  • Cool Twist® Gel Memory Foam This unique design features cooling gel swirled into premium memory foam. This breathable memory foam helps enhance airflow and heat dissipation for a feeling that can only be described as a cool, contouring type of comfort.
  • PillowSoft® Aire Soft foam provides enhanced cushioning for exceptional comfort and promotes airflow through its unique, gently rippling design.
  • 3 Zoned Coil Design - This 850-coil density system offers three support zones with targeted support for your lower back and hips and cradled comfort everywhere else.

Quick Specs

  • Brand: SERTA
  • Line: Perfect Sleeper
  • Type: Tight Top
  • Width: 60"
  • Height: 12"
  • Depth: 79.5"

See More

 
Featuring a 3 zoned coil design, this mattress offers pressure relief and support where you need it, with a Cool Twist® Gel Memory Foam that contours to your body-with upgrades available with more cooling layers and support.

Features

  • Cool Twist® Gel Foam - Cooling gel is swirled directly into a breathable foam designed to promote airflow and heat dissipation.
  • Cool Twist® Gel Memory Foam This unique design features cooling gel swirled into premium memory foam. This breathable memory foam helps enhance airflow and heat dissipation for a feeling that can only be described as a cool, contouring type of comfort.
  • PillowSoft® Aire Soft foam provides enhanced cushioning for exceptional comfort and promotes airflow through its unique, gently rippling design.
  • 3 Zoned Coil Design - This 850-coil density system offers three support zones with targeted support for your lower back and hips and cradled comfort everywhere else.
  • Anti-Microbial Technology - Our anti-microbial mattress technology will keep your mattress fresh and clean from odor-causing bacteria.
  • CertiPUR
  • Designed and Built in USA
  • Adjustable Base Compatible
  • 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
  • Gives the sensation of lying on top of the mattress with little give
  • 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 747935948495
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
SubFamily Name Cobalt Calm
Mattress Top Type Tight Top
Mattress Type Innerspring
Product Type Mattress
Year of Launch 2023
Dealer Line National Line
Layer 1 Material PerfectPure Fiber
Layer 1 Thickness (in) 1
Layer 2 Material Support Foam
Layer 2 Thickness (in) 0.5
Layer 3 Material Support Foam
Layer 3 Thickness (in) 0.5
Layer 4 Material Cool Twist Gel Memory Foam
Layer 4 Thickness (in) 1
Layer 5 Material Serta Support Foam
Layer 5 Thickness (in) 1
Layer 6 Material 850 3 Zoned Coil Support
Layer 6 Thickness (in) 8
Layer 7 Material Balanced Support Pad
Layer 7 Thickness (in) 1
Product Depth (in) 79.5
Product Height (in) 12
Product Width (in) 60
Shipping Depth (in) 80
Shipping Height (in) 12
Shipping Width (in) 61
Product Weight (lb) 73.84
Shipping Weight (lb) 75
Edge Support Technology Name Best Edge® Foam Encasement
Antimicrobial? Yes
Breathable Construction? Yes
Coil Count 651
Coil Density 850
Coil Type Pocketed Coil
Coil Gauge 14.75
Cooling Technology? Phase change material
Edge Support? Yes
Foam Infusion? None
Handles Included? Yes
Hypoallergenic? No
Is Mattress 2 Sided? No
Latex Free? No
Low Motion Transfer? Yes
Lumbar Support Yes
Mattress Comfort Level Extra Firm
Mattress Cover Design Floral
Mattress Cover Stitch Design Floral
Memory Foam? Yes
Moisture-Wicking? Yes
Natural Fibers? No
Pillow Top? No
Product Accent Color Light Blue
Product Cubes 34.31
Quilted Cover? Yes
Reinforced Center? Yes
Side Color Dark Blue
Top Cover Color Dark Blue
Zipper Cover Machine Washable? No
Zipper Cover? No
Product Warranty Length 10

Quick Specs


  • Manufacturer

  • Brand: SERTA
  • Line: Perfect Sleeper

  • Appearance

  • Type: Tight Top

  • Dimensions

  • Width: 60"
  • Height: 12"
  • Depth: 79.5"

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

Would buy again

April R 2/6/2026

Comfortable supportive
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Comfortable mattress

Prestine M 2/6/2026

Comfy supportive mattress
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Best nights sleep ever!

Beverly R 2/4/2026

Best nights sleep ever!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

New mattress

Laura E 2/4/2026

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

Yes, I recommend this product

5 Stars

Perfectly Dreamy!

Andrea H 2/4/2026

Great mattress! So comfortable with the support I need for a good nights rest.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Comfortable

Christine K 2/4/2026

Originally posted on www.serta.com

Yes, I recommend this product

3 Stars

Mattress review

Cindy N 2/4/2026

Purchased December 27,3025 and delivered 1/8/26. It is beginning to sink down in area beneath buttocks area. I weigh 169and husband weighs 254 and only had it for three weeks. Other than that it's comfortable. Concerned if will continue to sink further.
Originally posted on www.serta.com

No, I do not recommend this product

4 Stars

Comfy

Diane J 2/2/2026

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

Yes, I recommend this product

5 Stars

Serta Good Sleep

James G 2/1/2026

Firm mattress provides a restful and satisfying sleep - aches melt away.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great sleep

Daniel B 2/1/2026

Soft yet supportive.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Mattress

Bruce B 2/1/2026

Super comfortable
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Comfy

Betty S 1/30/2026

Very comfortable
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Quality

Barbara O 1/30/2026

Nice firm and great quality
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Twin Blue Lagoon Plush

Cynthia A 1/30/2026

Beautiful comfy mattress for guestroom.
Originally posted on www.serta.com

Yes, I recommend this product

3 Stars

Matress

Edward H 1/29/2026

I like mine but my wife said hers is two stiff for her
Originally posted on www.serta.com

No, I do not recommend this product

5 Stars

Mattress

Barbara H 1/29/2026

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Comfy mattress

Shafik K 1/29/2026

Originally posted on www.serta.com

Yes, I recommend this product

3 Stars

More firm than expected

Kelly D 1/29/2026

It probably needs more time to break in, but the mattress feels significantly more firm that the one we tried on display. I understand there is a break in period, but I am needing to put a mattress topper on just to be able to sleep on this. I reverted back to my old bed for a short time to recover from the first 10 days. Going to try again soon. I've also been walking on it and having my kids jump on it to try to soften it up. In the store, my body sunk into it really well. At home, it's more stiff, and I can't get comfortable.
Originally posted on www.serta.com

No, I do not recommend this product

5 Stars

Great Mattress

Bradley M 1/29/2026

Comfy and supportive mattress, great for a restful sleep !
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Wonderful

Amber Z 1/28/2026

I love this mattress so far. It's firm and soft at the same time
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Perfect sleeper

Nancy R 1/28/2026

Super comfy! Sleep is so much better.
Originally posted on www.serta.com

Yes, I recommend this product

3 Stars

Comfort

Frank C 1/27/2026

To soon to tell
Originally posted on www.serta.com

No, I do not recommend this product

5 Stars

Love it so far!

Jarrod H 1/27/2026

Love it so far!
Originally posted on www.serta.com

Yes, I recommend this product

3 Stars

PSL23Blueloggon

Sridutt T 1/26/2026

I got mattress on 12th Jan 2026 . It was comfortable for 10 days. However, it started sagging on one side & back started hurting
Originally posted on www.serta.com

No, I do not recommend this product

3 Stars

Bed sink

Jacquelyn C 1/26/2026

Soft but sleeping it feels like I'm in a sink whole. When up in morning I see a sink. Even.if I rotate it. It does the same
Originally posted on www.serta.com

No, I do not recommend this product

1 Stars

Sinks

Maria M 1/26/2026

Me and my husband are not over weight we are healthy BMI and this mattress sinks in significantly in each side we sleep on with a hump in the middle I have to roll up on to the hump To his side so cuddle him. I have back pain we are both side and back sleepers. I opted pillow top as I had a posturepedic medium pillow top that did not cause these problems until after having for 10 plus years.
Originally posted on www.serta.com

No, I do not recommend this product

2 Stars

Not satisfied

Caroline K 1/26/2026

I received the mattress without an indication of manufacture date
Originally posted on www.serta.com

No, I do not recommend this product

5 Stars

Excellent mattress

Jessica K 1/26/2026

Supportive, comfortable and helped ease my back and hip pain.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Firm is good!

Db B 1/24/2026

After 2 nights, so far - so good!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Sleep Firm

Dominique J 1/23/2026

So rejuvenating! I love it
Originally posted on www.serta.com

Yes, I recommend this product

3 Stars

Overall not bad

Nathan W 1/23/2026

Softer than I expected based upon the in-store model. Was expecting a little bit firmer of an experience which disappointed me. The store had this and extra-firm. If they'd had the regular firm, I probably would've gotten t hat.
Originally posted on www.serta.com

No, I do not recommend this product

5 Stars

Cloud Comfort

Brian H 1/22/2026

This mattress is awesome ! So comfortable and perfect for a side sleeper. No pressure points
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

MIL Loves it!

Deb W 1/20/2026

Got it for my 87 year old mom in love and she is sooo happy and absolutely loves it! Soft but not to soft, still supports!
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Firmer than we are used to.

Debra M 1/20/2026

Waiting for break in period, still too firm. Have slept on it for 4 nights so far.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Love it!

Veronica T 1/20/2026

Very soft and comfortable. I brought it for my guest bedroom and I will be buying another for my bedroom this year.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Supportive and comfortable

Virginia D 1/19/2026

Supportive and comfortable
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great Mattress!

Dan S 1/19/2026

Suoer comfy, supportive, getting great sleep!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Serra King mattress

Keith L 1/19/2026

Very comfortable!
Originally posted on www.serta.com

Yes, I recommend this product

3 Stars

Too firm

Barbara S 1/19/2026

Originally posted on www.serta.com

No, I do not recommend this product

4 Stars

My choice

Sandra O 1/18/2026

Comfy and supportive
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great Matress

Lorraine B 1/18/2026

Comfy and supportive
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Hard for a soft mattress but the softest one I found.

Sharon S 1/16/2026

Hard for a soft mattress but the softest one I found. It was by far the best price. I got the twin XL size and It's lightweight, the delivery man just picked it up and ran to the door with it.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

very nice

Diane P 1/16/2026

a problem with stitching but a representative came and fixed it
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Serta Twin XL

Lori E 1/14/2026

Great Supportive Mattress
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Best Night Sleep in a long time

Lakisha M 1/14/2026

This bed is so comfortable. It is the right amount of support. Great for restful sleep.
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Great Mattress

Ruben S 1/12/2026

It is a very good mattress but the remote to contol the head plattform cable is too short and if I am in bed and want to adjust it, I have to reach out too far and it falls on the floor sometimes.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Perfect Sleeper

Sylvia A 1/12/2026

I love this mattress! It's the second one I've bought. It's firm, supportive, and comfortable!
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Mattress

Irene D 1/11/2026

Comfy, very supportive, finally had a great nights sleep in a few months.
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Great mattress - extremely comfortable

Janet D 1/10/2026

This mattress provides great support and is extremely comfortable.
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Good nights sleep last night!

Jerry M 1/6/2026

Good nights sleep last night!
Originally posted on www.serta.com

Yes, I recommend this product