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Beautyrest Harmony Lux Mattress Review

The Beautyrest Harmony Lux Carbon Series is one of the latest additions to Beautyrest’s premium mattress line. The Harmony Lux combines soft foam with pocketed coils for a comfortable, luxurious feel.

At first glance, the Harmony Lux Carbon Series is a high quality mattress, but does it hold up under closer inspection? I’ve taken an in-depth look at this mattress’s construction, firmness, motion transfer, and more to help you decide if the Harmony Lux is a good fit for you.

Read on for my full review of the Beautyrest Harmony Lux mattress, or skip down to my review summary at the end of the page.

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Beautyrest Harmony Lux
Beautyrest Harmony Lux
Beautyrest Harmony Lux

The Beautyrest Harmony Lux is a solid innerspring mattress with a pillow top build that has a nice soft feel for side sleepers!

Brand Snapshot

Beautyrest is part of Serta Simmons Bedding, one of the oldest (and largest) bedding manufacturers in North America. Beautyrest started selling its luxury mattresses online in 2019, so though they’re well-established in the world of mattresses, they’re fairly new to the online mattress scene. But Simmons Beautyrest is aiming to bring its well-known luxury mattress experience right to your doorstep with perks like free white glove delivery and lengthy sleep trials.

So does the Beautyrest Harmony Lux live up to the Beautyrest name? And how does it compare to other popular models? Keep reading to find out!

What is the Beautyrest Harmony Lux Mattress Made Of?

The Harmony Lux is an innerspring mattress with a soft foam top layer. This mattress is almost 14 inches tall, but you have the option to add a pillow top for an extra plush feel, which would add a few extra inches in mattress height.

Let’s take a look at each layer to really get a feel for this mattress.

Cover – The Harmony Lux is covered in Seaqual™ sustainable fabric, making it a great choice for environmentally-conscious sleepers. Seaqual™ is a fabric made of recycled plastic waste. You can learn more about it in our FAQ section below. The cover is also quilted with soft foam, providing immediate pressure relief and sinkage.

Beautyrest Harmony Lux
The Beautyrest Harmony Lux in for the Sleepopolis review

Pillow Top – The Harmony Lux’s comfort layer is a plush pillow top. The first layer of this foam top is super soft InfiniCool™ Lux foam. This poly foam provides great pressure relief, but also has a quick response to pressure, so you won’t feel “stuck-in” the mattress. Below that is a thin layer of AirFeel™ memory foam which helps contour your body. The comfort layer also includes RightTemp Wave foam, a soft poly foam made with conductive carbon fibers for increased breathability and support. All this foam makes the Harmony Lux a great pressure-relieving option for side sleepers.

Support Layer – The Harmony Lux’s precision support system is made up of T2 pocketed coil technology. T2 is an innovative coil design exclusive to Beautyrest. The coils are individually wrapped in fabric, so they’ll provide better motion isolation than traditional steel coils. The coils are also surrounded by high-density polyurethane foam, a nice feature that will let you sleep all the way on the edge of this mattress without collapsing it.

Beautyrest Harmony Lux Materials
The Beautyrest Harmony Lux uses an innerspring design

What Does the Beautyrest Harmony Lux Mattress Feel Like?

It’s great to know what’s inside a mattress, but what does the Harmony Lux actually feel like?. Let’s dive into mattress firmness first!

Before we get into it, remember to keep in mind that mattress feel will vary from person to person. Your ideal mattress firmness will depend on your body weight, sleeping position, and personal preference. For reference, I’m 5’10”, weigh 190lbs., and like to sleep on my stomach.

The Harmony Lux offers a plush, medium, and extra firm model. I tested the medium mattress. I actually found this mattress to be on the softer side. I rated it as a 5.5/10 on the firmness scale. For reference, the industry standard for medium firmness is 6.5/10.

Beautyrest Harmony Lux
I found the Beautyrest Harmony Lux to be pretty soft

I’d recommend this soft mattress to side sleepers as they’ll benefit greatly from the pressure relief and body contouring from the plush foams on the surface. This mattress is also a great option for sleepers who suffer from shoulder pain. The soft top will provide plenty of stiffness-preventing cushion.

Back sleepers who prefer a soft feel might also like this mattress. The innerspring structure will provide these sleepers with gentle-feeling lower back support. Combo sleepers who like a plush mattress but need mobility might like the Harmony Lux as well — its T2 coil support system provides a nice bounce.

Beautyrest Harmony Lux Side Sleeper
Side sleepers will appreciate the Beautyrest Harmony Lux

The Harmony Lux is also a good choice for heavier sleepers who prefer a soft-feeling mattress. The innerspring coils in this mattress will provide the extra support they need.

This mattress is probably not a good choice for stomach sleepers. The plush pillow top will let them sink too deeply into the mattress, throwing their hips and shoulders out of alignment. They’ll likely prefer something firmer. If you’re a stomach sleeper, you can check out my Best Mattress for Stomach Sleepers roundup to find a mattress that meets your sleep needs.

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Beautyrest Harmony Lux
Beautyrest Harmony Lux
Beautyrest Harmony Lux

The Beautyrest Harmony Lux is a solid innerspring mattress with a pillow top build that has a nice soft feel for side sleepers!

Testing the Beautyrest Harmony Lux Mattress

Firmness is often a subjective score, so I also run specialized tests on the mattresses I review to give you a better idea of what to expect. I’ll go into detail about the pressure relief, motion transfer, and edge support the Harmony Lux offers below. All those objective readings will help you decide if this mattress is right for you.

Pressure Relief

Pressure relief refers to a mattress’s ability to relieve tension in areas like the hips, shoulders, and lower back. Too much pressure in any of those spots can lead to pain and sensitivity, so it’s important to find a mattress that provides enough cushion for your body type and sleeping position.

To test out the pressure relief on the Beautyrest Harmony Lux I rolled a pressure map out on the mattress and lay down on top of it on my side, back, and stomach. The mat measured the amount of pressure the mattress placed on my body and created a color-coded map. The pressure map ranges from blue in low-pressure areas up to red in high-pressure areas.

Let’s take a look at the Harmony Lux’s pressure map!

Beautyrest Harmony Lux Pressure Map
The Beautyrest Harmony Lux is great at relieving pressure

Back – The Harmony Lux provides some great pressure relief for back sleepers. As you can see, my weight is evenly distributed across the mattress. While I definitely felt supported, I did feel myself sink into the mattress when I was on my back. Back sleepers who like a softer mattress will probably appreciate this sinkage, but if you’re a back sleeper who prefers a firmer feel, you might prefer the Beautyrest Hybrid, which I’ll discuss in more detail below.

Side – When I lay down on my side, the pressure map picked up on a little bit of green at my shoulders. That’s in the acceptable range — a mattress that’s too firm for side sleepers will spike into the red or yellow range at the shoulders or hips. The softer foams in the pillow top of the Harmony Lux provide great pressure relief for side sleepers. I’d definitely recommend this mattress for side sleepers.

Stomach – This mattress is not quite firm enough for stomach sleepers. When I lay down on my stomach I could feel my hips sinking into the pillow top. Stomach sleepers should keep their hips level with their shoulders to prevent any back pain. The Beautyrest Black is a much better fit for stomach sleepers considering a Beautyrest mattress, it offers the firmest support in the Beautyrest line.

Beautyrest Harmony Lux Back Sleepers
Back sleepers looking for a softer feel will like the Beautyrest Harmony Lux

Motion Transfer

I also tested how the Harmony Lux handled motion transfer, which measures how much movement travels across a bed. A mattress with low motion transfer will isolate motion, keeping movement on one side of the bed from disturbing someone on the other side. This is an important consideration for couples and people who sleep with pets or children.

I measure motion transfer by dropping a 10lb steel ball onto one side of the mattress from three different heights. A seismometer measures how much of that movement travels over to the other side of the bed.

Take a look at the Beautyrest’s results here:

Beautyrest Harmony Lux Motion Transfer
These are awesome results on the disturbance test for the Beautyrest Harmony Lux

I was really impressed with the Harmony Lux’s motion transfer results. It did a great job isolating motion, so if you sleep with a restless partner I’d consider this mattress. It should keep you from feeling disturbed by their movements throughout the night.

The Harmony Lux also has a good amount of bounce and responsiveness. The innerspring support structure keeps you from sinking too deeply into the mattress and feeling “stuck-in-bed” like you would on a memory foam mattress. This is not normally the case with mattresses that do a good job isolating motion.This unique mix of responsiveness and motion isolation makes the Harmony Lux an excellent option for couples looking for a softer mattress.

Edge Support

My last test measures edge support. If a bed has good edge support, its edges and corners can support you when you roll towards them. If it doesn’t have good edge support, they collapse under your weight. Couples who need to spread out on a mattress and heavier sleepers who need additional support will want to pay attention to this test.

To test edge support, I rolled all the way to the edge of the mattress. I was impressed with the edge support on this bed. I could lay on the very edge of the mattress without feeling like I was going to fall off. I really encourage folks who sleep with a partner to check out this mattress. Its combination of edge support, motion isolation, and responsiveness make it a great bed for couples.

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Beautyrest Harmony Lux
Beautyrest Harmony Lux
Beautyrest Harmony Lux

The Beautyrest Harmony Lux is a solid innerspring mattress with a pillow top build that has a nice soft feel for side sleepers!

Beautyrest Harmony Lux Mattress Vs.

Simmons Beautyrest is one of the most established mattress brands in the industry. But how does it stack up against some of its biggest competition in the luxury mattress space? Let’s take a look at how the Beautyrest Harmony Lux compares to the Saatva Classic and WinkBeds mattresses to find out.

Saatva Classic

The Saatva Classic and Harmony Lux are both popular luxury innerspring mattresses. Check out some of the Saatva’s key features below, and check out my full Saatva Mattress Review to learn about this mattress in detail.

  • The Saatva is another example of the classic innerspring mattress type. Like the Harmony Lux, it is not a boxed mattress. The Saatva offers three firmness levels, and its firm option may be a better fit for stomach sleepers than the softer Harmony Lux.
  • The Saatva is very bouncy, which makes it a good choice for combo sleepers who need a lot of mobility.
  • Like the Harmony Lux, the Saatva offers consistent support that makes it a good choice for heavier sleepers. Saatva also offers the Saatva HD, a mattress designed specifically to support heavyweight sleepers. Heavier sleepers who prefer a soft comfort level might still prefer the Harmony Lux.


The WinkBeds mattress is a hybrid bed-in-a-box. It’s one of the more popular hybrids on the market, so let’s take a look at how it differs from the Beautyrest Harmony Lux. You can find out more about this mattress in my full WinkBeds Mattress Review.

  • The WinkBeds mattress is nice and bouncy, great for combo sleepers who need to switch positions with ease. The Harmony Lux is also responsive, but not quite as bouncy as the WinkBeds mattress, which makes it a better option for couples.
  • Even though it’s a boxed mattress, the WinkBeds mattress still offers a traditional innerspring feel, which makes it a convenient option for sleepers who want their mattress to arrive compressed, but don’t want to give up the support innerspring mattresses offer.
  • The WinkBeds medium pillow top model is a great option for back sleepers who want a pillow top mattress that’s firmer than the Harmony Lux.

Other Models

Beautyrest also makes a few other models. Other mattresses in the Harmony line include the original Beautyrest Harmony mattress and the Beautyrest Harmony Lux Diamond Series mattress. The Carbon is the first mattress in this line I’ve reviewed. But I’ve also tested the Beautyrest Black and Beautyrest Hybrid, so let’s take a look at how those mattresses compare to the Harmony Lux.

Beautyrest Black

  • The Harmony Lux is softer than the Beautyrest Black, which is the firmest mattress offered in the Beautyrest line, about a 7.5/10 on the firmness scale. It should appeal to stomach and back sleepers who need firm support to keep their spines neutrally aligned.
  • The Beautyrest Black also sleeps cooler than the Harmony Lux. Both mattresses use cooling technology, but the GelTouch® memory foam in the Black gives this mattress an edge. If you prioritize a cool sleep environment, you may want to opt for the Beautyrest Black.
  • If you want to learn more about this model, check out my Beautyrest Black Mattress Review.

Beautyrest Hybrid

  • The Beautyrest Hybrid feels similar to the Harmony Lux, but has more of a medium-firm feel. The balance of pressure relief and support in this hybrid mattress makes it a great option for back and side combination sleepers.
  • Like the Harmony Lux, the Beautyrest Hybrid is a good option for couples. The cooling Beautyrest gel memory foam in the hybrid does a great job isolating motion to cut down on disturbances from restless sleepers.
  • Learn more about this model in my Beautyrest Hybrid Mattress Review.
Beautyrest Harmony Lux
The Beautyrest Harmony Lux

Should You Buy the Beautyrest Harmony Lux Mattress?

Is the Beautyrest Harmony Lux the right mattress for you? This soft mattress offers a balance between pressure relief and support that should be especially appealing to side sleepers. It’s mix of responsiveness and motion isolation also make it a great choice for couples.

Take a look at some of the pros and cons of the Harmony Lux below to see if you’ll get your best sleep on this mattress.

Beautyrest Harmony Lux Carbon Series Pros

  • If you’re a side sleeper this mattress is a great fit for you. The Harmony Lux’s soft comfort foams offer advanced pressure relief that makes it an especially good option for relieving shoulder pain.
  • The edge support and motion isolation in the Harmony Lux make this mattress a great option for couples.
  • I’d also recommend the Harmony Lux for its durability. Soft mattresses aren’t always super durable, but the Harmony Lux is really well built and should stand the test of time.

Beautyrest Harmony Lux Carbon Series Cons

  • The Harmony Lux is a little too soft for stomach sleepers. These sleepers should opt for a firm mattress like the Beautyrest Black to avoid any back pain.
  • This mattress also slept a little bit hot. The Beautyrest Black and Beautyrest Hybrid both use geltouch foam for a cool-to-the-touch sleep surface, so if you tend to overheat you may have a better night on one of those mattresses.
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Beautyrest Harmony Lux
Beautyrest Harmony Lux
Beautyrest Harmony Lux

The Beautyrest Harmony Lux is a solid innerspring mattress with a pillow top build that has a nice soft feel for side sleepers!

How Much Does the Beautyrest Harmony Lux Cost?

You can take a look at the full pricing for the Harmony Lux in the chart below. The price listed will be before discount or offer for each size. But be sure to check out our mattress coupon page for additional savings

SizeDimensionsStandardPillow Top
Twin38" x 75" x 15"$1,299$1,499
Twin XL38" x 80" x 15"$1,349$1,549
Full53" x 75" x 15"$1,419$1,619
Queen60" x 80" x 15"$1,499$1,699
King76" x 80" x 15"$1,999$2,199
California King72" x 80" x 15"$1,999$2,199

Beautyrest Harmony Lux Mattress Policies

  • Shipping – Free White Glove Delivery
  • Trial Period – 100 Nights
  • Warranty – 10 Year Limited Warranty


How long will the Beautyrest Harmony Lux mattress last?

Any of the Simmons Beautyrest mattresses should last you seven to ten years, but it’s always a good idea to reassess the support of your mattress after five years.

Can you flip the Beautyrest Harmony Lux mattress?

No, you should not flip this mattress. It’s built with a comfort layer on top, and will be uncomfortable if you turn it over and sleep on the base. If you’re concerned about wear, you can rotate the mattress 180 degrees every six months. Simmons Beautyrest mattresses are durable, so you don’t need worry about not being able to flip them.

Do Beautyrest mattresses need a boxspring?

No, you don’t need a boxspring with Simmons Beautyrest mattresses. If you choose not to use a box spring, you can place this mattress on a bed frame that includes slats of no more than two inches apart. The Harmony Lux is also compatible with Beautyrest’s adjustable bases.

What is Seaqual™ Fabric?

Seaqual™ is an eco-friendly fabric made of recycled plastic waste. The Seaqual™ team sources plastic water bottles from polluted seabeds and uses sustainable fabric technology to turn them into a durable and luxurious fabric. Its Seaqual™ cover makes the Beautyrest Harmony Lux a great choice for sleepers who want to help promote cleaner oceans.

Logan Block
Logan is the content director of Sleepopolis, which means he not only reviews new mattresses every week, but also curates all the comparisons, best of pages, and video guides on the site. He takes a straightforward, honest approach to his reviews and endeavors to give viewers an objective look at each new product he tries out. Logan has perfected his method by personally testing over 200 different mattresses, so he’s not only able to discern the overall vibe of a specific bed, but to contextualize its feel within the bed-in-a-box market as a whole. When he’s not hopping on a new bed or working with our editorial team to whip up an engaging sleep education guide, you can find him reading books on world history, walking his dog Pepper, or searching for the best cheeseburger in New York City.