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4.6 | 1274 Reviews

Perfect Sleeper Cobalt Calm 12" Extra Firm Mattress -Twin

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: 38"
  • Height: 12"
  • Depth: 74.5"

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 747935948471
Computed Mattress Size Twin
Country of Manufacture USA
Assembled in USA? Yes
Computed Product Type One Sided Mattress
Product Category Mattress
Family Name ,
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) 74.5
Product Height (in) 12
Product Width (in) 38
Shipping Depth (in) 75
Shipping Height (in) 12
Shipping Width (in) 38
Product Weight (lb) 43.84,
Shipping Weight (lb) 45
Edge Support Technology Name Best Edge® Foam Encasement
Antimicrobial? Yes
Breathable Construction? Yes
Coil Count 336
Coil Density 491
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 21.11
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: 38"
  • Height: 12"
  • Depth: 74.5"

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

Comfort

Charles S 3/14/2025

Mattress is firm but comfortable with pillow top. Excited for a good nights sleep 🙂
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Finally some good sleep at the beach!

Laura K 3/14/2025

Thank you! Wonderful mattress!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Serra experience

Vinson B 3/13/2025

Super comfy and the movers were super fast
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great!

Tim E 3/12/2025

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Perfect for me.

Dario P 3/12/2025

The most comfortable mattress I've had in years. Firm with a pillow top.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Plush and firm

Joseph R 3/11/2025

Nice height
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Very comfortable and a great price

Zoe B 3/11/2025

This mattress is extremely comfortable! I can't believe the great price I paid
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great sleep

Irene J 3/11/2025

Very comfortable. Restful sleep,
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Blue Luxury

Karen S 3/10/2025

Extremely comfy amd luxurious!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Happy

Neeka D 3/9/2025

I can finally sleep comfortably again!!!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Excellent

Melanie W 3/8/2025

I am so in love with my mattress
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Sleep with spine arthritis

Sally B 3/8/2025

It's great. Holds my spine firmly while laying down.
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Comfortable

Robert S 3/7/2025

Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Comfortable

Robert S 3/7/2025

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Sleep

Randy S 3/6/2025

Very comfortable.
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

COMFORT

Jeff F 3/6/2025

VERY COMFORTIBLE
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Love this new mattress!

Mary M 3/6/2025

This mattress is so comfortable! And they hauled our old one off! Very happy!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

2025 Serta PSL23 MATTRESS

Lillian C 3/4/2025

Supportive mattress
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Comfortable

Jose B 3/4/2025

Comfortable mattress, wake up feeling well rested.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Blue Lagoon Nights!

Barbara S 3/3/2025

Great sleep from the very first night!
Originally posted on www.serta.com

Yes, I recommend this product

3 Stars

Blue Lagoon

Melissa K 2/28/2025

Originally posted on www.serta.com

No, I do not recommend this product

1 Stars

Not a great mattress!!

Vickie P 2/28/2025

We have had ours less than a month and it has humps in it already, very uncomfortable!!
Originally posted on www.serta.com

No, I do not recommend this product

5 Stars

Blue Lagoon

Lissa R 2/27/2025

Very soft yet good support
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Firm but plush

Judy S 2/27/2025

The mattress is very comfortable. It seems a little firm, but the plush pillow top helps it to be more comfortable. So far I am satisfied with the mattress.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

LOVE THE FEELING

Lillian B 2/26/2025

My body feels like this is not the same body that I had before sleeping on this new mattress. I don't wake up with the stiffness that I had previously. What a difference I feel in my whole body, it was worth every penny.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Sleeping like a baby!

Emonte B 2/25/2025

This is the best mattress I have ever owned! Whether I take a 2 hour cat nap or I get 6-8hrs of rest it feels like 20 hours have gone by. The detail in the design is nice and the firmness holds up, it's my favorite thing in my bedroom. First time owner of a Serta but certainly I have become a lifetime customer!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Comfy and supportive mattress

Enrique C 2/25/2025

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

Yes, I recommend this product

2 Stars

Not what we expected

Kelly O 2/22/2025

The top of the bed forms divots or indentations and it is difficult for us to move or roll over during the night. The foam on top also feels extremely hot.
Originally posted on www.serta.com

No, I do not recommend this product

5 Stars

Very light

Kathleen L 2/22/2025

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

My Serta Perfect Sleeper

Marilyn M 2/22/2025

The mattress is very comfortable and gives great support⁰
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great Bed

Christopher F 2/22/2025

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

Yes, I recommend this product

1 Stars

Failure to Deliver Mattress Bundle

Dave A 2/21/2025

I purchased a queen size Serta mattress and adjustable base with the understanding I would also receive a queen sized "Mattress Bundle" which did not arrive. I'm very disappointed about not having received the "Mattress Bundle" and am still deciding whether to keep the Serta mattress and adjustable base.
Originally posted on www.serta.com

No, I do not recommend this product

2 Stars

Already getting divits

Melissa L 2/21/2025

I love the mattress when I originally got it, but after sleeping in it with my partner, it has already started getting divots in it and we must rotate it regularly. I'm going to actually try to upgrade back to.
Originally posted on www.serta.com

No, I do not recommend this product

5 Stars

Not too firm, Not too soft, but JUST RIGHT

Theda D 2/20/2025

Slept great the first night!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

The perfect firmness and still a soft night's sleep.

Tyler D 2/20/2025

The bed is nice and firm, supportive on all sides and edges. Feels great getting into and still get that nice soft sleep when rolling over or on your side. Highly recommend
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

New Mattress

Vernon B 2/19/2025

The mattress is very firm and comfortable.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Adoring Plush Night Sleep

Gloria D 2/17/2025

This is probably one of the most plushes mattresses I've ever owned by Serta and probably my first, but it sleeps extremely comfortable and restful, would highly recommend in the setup by the delivery team. Was top-notch, thanks.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Bought for my grand daughter's bedroom

Donna M 2/17/2025

Very satisfied with the mattress
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Pretty good

Ryan M 2/17/2025

It's comfy but a little stiff . With a mattress topper its perfect.
Originally posted on www.serta.com

Yes, I recommend this product

2 Stars

Not What I expected

Frank M 2/17/2025

The mattress was comfy for about a month or two, then it seemed to quickly have sagging areas along the side (sitting on side of bed) and in the middle. We sought a new mattress due to pressure points experienced with out Temperpedic mattress. We were assured that that would not be an issue with this new Serta mattress. Well. I am now regretting that decision.
Originally posted on www.serta.com

No, I do not recommend this product

5 Stars

Good quality

Kathleen P 2/16/2025

Very comfortable and supportive
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Love it

Toni A 2/15/2025

I just love it.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Perfect Matress for side sleepers

Oscar D 2/15/2025

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

Yes, I recommend this product

4 Stars

Still under 30 day trial period

Sue A 2/15/2025

I'm enjoying this mattress so far. The first week was rough to fall asleep simply because with each twitch, I was basking in just how good it feels. I don't know if the top should develop a sinking indentation (close up pic) but it isn't bothersome yet but it is in fact noticeable laying on it. I never owned a mattress in this price range know if this is normal or not. I will definitely keep my eye on it & the calendar as I'm still in the trial period. The registration with the QR code was a pleasure, sure was easy and I took a screenshot of the confirmation just for added measure. Hopefully someone from Serta will read this and reach out to me about the developing indentation.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Adjustable bed adjusts to my life

Austin H 2/15/2025

I will never not own another automatically raising bed again. This is magical.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great Mattress and Great Comfort

James C 2/15/2025

I have been using a older mattress that does I wake up with more back pain and hip pain than I went to sleep with. This mattress really cures my pains and lets me recover overnight! I liked it so well I bought another for our spare bedroom for when the kids come.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Satisfied

Sean B 2/14/2025

Very comfortable. Very well manufactured. Reasonably priced
Originally posted on www.serta.com

Yes, I recommend this product

1 Stars

Horrible unless you like sleeping on a rock

Worst 2/13/2025

Horrible mattress glad I was able to get a refund even though that took 2 weeks to get back.
Originally posted on www.serta.com

No, I do not recommend this product

4 Stars

Good

Stan T 2/13/2025

Stan is better able to sleep on this extra-firm mattress.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Firm Mattress is Great

Thaity 2/12/2025

Have been sleeping on this for a month and it's perfect for me. Very firm, lots of back support, height is not too tall. The first several days the mattress had a smell but it disappeared; definitely recommend airing out the mattress (without sheets) a couple of days if possible.
Originally posted on www.serta.com

Yes, I recommend this product