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4.6 | 469 Reviews

Classic Alden 11.5" Medium Mattress -King

Classic

Features

  • Breathable Cover A soft, breathable cover helps you rest and wake refreshed
  • 3 Zoned Body Support offers 3 separate zones to provide lower back support for classic comfort
  • This 800-coil density system provides contouring, cradling support and minimizes motion transfer
  • CertiPUR-US® Certified

Quick Specs

  • Brand: SERTA
  • Line: Classic
  • Type: Tight Top
  • Width: 76"
  • Height: 11.5"
  • Depth: 79.5"

See More

 
Featuring 3 zones for lower back support, breathable fabrics, and responsive coils for classic comfort-plus upgrades available for cooling pressure relief.

Features

  • Breathable Cover A soft, breathable cover helps you rest and wake refreshed
  • 3 Zoned Body Support offers 3 separate zones to provide lower back support for classic comfort
  • This 800-coil density system provides contouring, cradling support and minimizes motion transfer
  • 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
  • Medium - Perfect for all sleepers-side, back, stomach or combination sleepers
  • 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 810150416503
Computed Mattress Size King
Country of Manufacture USA
Assembled in USA? Yes
Computed Product Type One Sided Mattress
Product Category Mattress
Family Name Classic
SubFamily Name Alden
Mattress Top Type Tight Top
Mattress Type Innerspring
Product Type Mattress
Year of Launch 2024
Dealer Line National Line
Layer 1 Material Fiber Based Layer
Layer 1 Thickness (in) 0.1
Layer 2 Material PillowSoft Aire
Layer 2 Thickness (in) 1
Layer 3 Material PillowSoft Foam
Layer 3 Thickness (in) 0.5
Layer 4 Material 3 Zone Body Support
Layer 4 Thickness (in) 1
Layer 5 Material 800 Edition Custom Support Coil System
Layer 5 Thickness (in) 8
Layer 6 Material Serta Balanced Support
Layer 6 Thickness (in) 1
Product Depth (in) 79.5
Product Height (in) 11.5
Product Width (in) 76
Shipping Depth (in) 79.5
Shipping Height (in) 11.5
Shipping Width (in) 76
Product Weight (lb) 94.55
Shipping Weight (lb) 94.55
Adjustable Base Compatible? Yes
Antimicrobial? No
Breathable Construction? Yes
Coil Count 840
Cooling Technology? No cooling technology
Edge Support? Yes
Foam Infusion? None
Handles Included? No
Hypoallergenic? No
Is Mattress 2 Sided? No
Latex Free? Yes
Low Motion Transfer? Yes
Lumbar Support Yes
Mattress Comfort Level Medium
Mattress Cover Design Geometric
Mattress Cover Stitch Design None
Mattress In A Box? No
Memory Foam? Yes
Moisture-Wicking? Yes
Natural Fibers? No
Pillow Top? No
Primary Foam Type Polyurethane
Product Accent Color Light Blue
Quilted Cover? No
Reinforced Center? No
Side Color Off-White
Top Cover Color Multicolor
Weight Capacity 1000
Zipper Cover Machine Washable? N/A
Zipper Cover? No
Product Warranty Length 10
Does it Ship in a box No

Quick Specs


  • Manufacturer

  • Brand: SERTA
  • Line: Classic

  • Appearance

  • Type: Tight Top

  • Dimensions

  • Width: 76"
  • Height: 11.5"
  • Depth: 79.5"

Video Assets

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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

92% of reviewers recommend this product.

5 Stars

Serra Mattress

William K 6/5/2026

Comfy & Supportive mattress
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Good mattress

Atef H 6/5/2026

Good look Mattress
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Best sleep ever!!

Kimberly P 6/5/2026

This mattress set did not disappoint, and the price was amazing as well!!
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Too New to Tell

Sheena B 6/3/2026

Only a week, but it's been fine so far
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

King Mattress

Doni K 6/3/2026

New king mattress feels great
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

So far so good

Kendra C 6/3/2026

Slept great 3 nights in a row.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great support

Maryellen A 6/2/2026

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

Yes, I recommend this product

5 Stars

Serta Mattress

Stacie W 6/2/2026

Excellent mattress
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Serta

Janet D 6/2/2026

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Very comfy

Jeri W 6/1/2026

Very happy so far!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Serta Classic Morning Slumber Traditional

Sandra R 5/31/2026

I just set this matress up in a guest room. I will update review once I have guests over. It seems comfortable. Purchased at Sam's Club and it came with a free foundation. 5/31/26
Originally posted on www.serta.com

Yes, I recommend this product

3 Stars

A little firm for a medium

Rebecca I 5/31/2026

Just purchased yesterday but much firmer than I thought it would be for a medium. We will see but no relief from the morning back pain when waking on it this morning.
Originally posted on www.serta.com

No, I do not recommend this product

5 Stars

Morning slumber review

Logan B 5/31/2026

This mattress is very comfortable!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Matree

Leticia I 5/31/2026

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

COMFORTABLE

Gail D 5/31/2026

Never will buy a memory foam again! This mattress is comfortable!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Serta Mattress - Sam's Club

Gabriel C 5/31/2026

Mattress is more than efficient and comfortable for that price!
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Plush

Alyssa Z 5/31/2026

It's comfortable
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Good quality

Wilfredis M 5/31/2026

The mattress is good quality and perfect size. Soo comfy.
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

King Serra Classic

Maurice P 5/30/2026

mattress is in the master mobile home bedroom, feels spongy
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Hoping it is a great mattress

Donna A 5/30/2026

Just bought it at Sam's club for our spare toom
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Serta

Isabel R 5/30/2026

Helped with back pain
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Me encanta

Kelvin mariano R 5/30/2026

Esta excelente, increible calidad y precio.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Serta Matress

Perla G 5/30/2026

Upgraded to a Serta morning slumber and couldn't be happier. Delivery was smooth, the mattress expanded perfectly with no weird chemical smell, and it is incredibly comfortable. It's the perfect mix of soft padding on top and firm support underneath.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Serta mattress

Michael M 5/30/2026

Sleeping better
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great medium firm mattress

Brittany D 5/30/2026

Great mattress for a great price
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Mattress

Bonnie D 5/30/2026

It's a great mattress I sleep better and my back doesn't hurt anymore and the price doesn't hurt your wallet.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great product for the price

Pamela N 5/29/2026

I just got my mattress set today I love it
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Just right

Lisa L 5/29/2026

Comfortable mattress. Not too hard, not too soft.
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

New mattress.

John B 5/29/2026

It's a little firmer than our previous mattress, but looking forward to using it.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Awesome mattress

Ben R 5/29/2026

Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Mattress

Shanette L 5/29/2026

It's really plush
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Mattress and Boxspring

Harold C 5/28/2026

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Morning Slumber Review

Deirdre C 5/28/2026

It definitely a good mattress. After not having a mattress for 8 years it feels great to wake up in a comfortable bed.
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Great price

James H 5/27/2026

Great value for the money
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Good quality

Brenda C 5/27/2026

The bet was hard the first day, but I think that is just something that you get used it to it! I enjoyed it more as time when on. I was good deal for the price which included the box spring
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Serta Morning Slumber Medium

Alan A 5/27/2026

Just delivered. Seems firm enough. Haven't slept on it yet. Replacing another 10 year old Serta product that did pretty well. Hoping this is the same.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Good sleep so far

Edward L 5/27/2026

Been sleeping on it four nights been good.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great mattress at the price point

Keith F 5/26/2026

Purchased at Sam's Club came with box spring. Great mattress
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Good sleeping

Burley B 5/26/2026

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

New mattress

Tammie V 5/26/2026

Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Firm

Aileen E 5/25/2026

This medium is actually firm My back felt great
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Feels like sleeping on sheep.

Leslie C 5/25/2026

This is the third mattress. I have bought from this company. I have no problems with none of them, And I sleep good with all the ones i bought..
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

To happy

Kathleen P 5/25/2026

Mattress is very comfortable
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Ahhhhmazing

Cameron M 5/25/2026

This Serta Morning Slumber Medium King size mattress from Sam's Memorial Day sale including 2 Twin Size low profile Serta box springs is exactly what the doctor ordered
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Lose Threads

Reia T 5/25/2026

We just purchased this brand new mattress at Sam's Club in our area and there's lose threads.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Comfortable mattress

Al jr N 5/25/2026

Just purchased this mattress happy with it
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Bought for the spare bedroom

Rachael M 5/25/2026

Book a king for our spare bedroom for guests? Was told by a C-pap wearer that it was the best sleep they've gotten in a long time!
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Good quality mattress

Bianca P 5/24/2026

Nice medium soft mattress. Very confortable.
Originally posted on www.serta.com

Yes, I recommend this product

5 Stars

Great product

Leticia D 5/24/2026

Great price and mattress
Originally posted on www.serta.com

Yes, I recommend this product

4 Stars

Just bought

Colleen B 5/24/2026

Only had a short amount of time. I feel it's comfortable now I need to wait to see how durable it is.
Originally posted on www.serta.com

Yes, I recommend this product