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Sealy Hybrid Performance Copper II and Kelburn II Review

For this review I’ll be digging into the middle level of the Sealy Hybrid Line, the Sealy Hybrid Performance. Situated between the Essentials (least expensive) and the Premium (most expensive), the Performance combines gentle foam with a Tempurpedic pocketed coil system for a sleep that aims to be as pressure-relieving as it is supportive.

But just how comfortable is it actually? I won’t know until I put it to the test, sussing out its feel, motion transfer, and sinkage to figure out if it might just be the mattress of your dreams!

I should note that this write-up is going to be a little different than my other Sealy Hybrid ones because the Performance comes in two models: the Kelburn II and the Copper II. While similar, they’ve got some distinct specs, which I’ll be breaking down throughout the assessment.

Continue reading below for my full review of the Sealy Hybrid Premium mattress. Don’t have time to read it all? Click here to skip to the bottom and check out my review summary.

Sealy Hybrid Performance Copper II Mattress
Sealy Hybrid Performance Copper II Mattress

A mix of gentle foams and pocketed coils makes the Copper II a great pick for combo sleepers! 

Sealy Hybrid Performance Kelburn II Mattress
Sealy Hybrid Performance Kelburn II Mattress

The Kelburn II mattress offers body-conforming pressure relief and cooling memory foam! 


As I mentioned up top, the Sealy Hybrid Premium comes in two different variations, so I’m going to walk you through their individual constructions below!

The Kelburn II is built with four layers of gentle foam and pocketed coils, stacking up to a total 14” of comfort. When compared to its mattress comrade the Copper II, it’s a little bit softer, thanks to an additional layer of Sealy’s Cushion Extra Soft Foam.

Sealy Hybrid Performance
The Copper II and Kelburn II look identical on the outside, but have different layers leading to different firmness and feel

Kelburn II

  • Cover – The cover is made up of a thick knit material that has a cozy hand feel. The fabric is also imbued with moisture-wicking properties, which help to draw body heat away from the sleeper and regulate temperature throughout the night. I should mention that this cover is the same one used in the Copper II.
  • Comfort Layer – The first layer here is built with 1.5” of gel memory foam. This material has a slow response to pressure, so you’re likely to sink in for some satisfying pressure relief. While this body contouring would typically result in overheating, Sealy’s managed to mitigate this with a gel infusion that keeps things nice and cool.
  • Contour Layer – As you sink further into the mattress, you’ll encounter a 2” contour layer of the brand’s ComfortSense Foam. This sections helps to extend the great pressure relief from the comfort layer deeper into the structure, providing a lot of cushiony support to the shoulders and hips, an important feature for side sleepers to note.
  • Transition Layer – Directly below the contour layer, you’ll find 1” of Sealy Cushion Extra Soft Foam. This section is meant to help the sleeper gradually transition from the softer top layers into the firm pocketed coil system. As we discussed above, this foam is only present in the Kelburn II and makes it a slightly softer bed overall than the Copper II.
  • Support Layer – And finally, we have the Tempurpedic pocketed coil system. This layer is going to bring some buoyant support to the structure, which will help to keep the sleeper positioned on top of the bed. Additionally, since the coils here are individually wrapped, they’ll be able to isolate motion throughout the bed, so you shouldn’t be too disturbed by your partner’s movements in the night.
Sealy Hybrid Performance Kelburn Construction
Showing the layers of the Sealy Hybrid Performance Kelburn II

As you may have guessed, the Copper II is a slightly firmer bed than the Kelburn II. Instead of a layer of Extra Soft Foam, the Copper employs an extra layer of firm support foam as well as a thin base of high-density poly foam. While these changes may not seem drastically different, they do contribute to the bed’s totally unique feel.

Copper II

  • Cover – As in the Kelburn, the Copper features a thick knit cover that’s both incredibly cozy and excellent at wicking moisture away from the body.
  • Comfort Layer – Built with 1.5” of gel memory foam, the comfort layer here is the same one used in the Kelburn. The material has a slow response to pressure, producing deep body contouring for relief and comfort. Though memory foam has a reputation for overheating, Sealy’s taken care of that by infusing its foam with cooling gel.
  • Contour Layer – Again, we see Sealy using a 2” layer of ComfortSense foam for its contouring section. This material will help to draw the contouring of the comfort layer deeper into the mattress, which could be an especially attractive feature for combo sleepers in search of relief at the shoulders and hips.
  • Transition Layer – Once you get down to the transition layer, you find the biggest difference between the two beds as the section here is made up of 1” of Sealy Support Foam. This material is a bit firmer than the ones we’ve seen thus far and helps to transition the sleeper into the pocketed coil section below. As you’ll notice later, this section is also what leads to the Copper II having a little less sinkage than the Kelburn II.
  • Support Layer – The support layer is made with the same Tempurpedic pocketed coil system we saw in the Kelburn II. Here as in there, its main function is to bring some bouncy support to the structure, helping to position the sleeper on top of the bed. The use of Tempurpedic technology also brings some added support to the lumbar region.
  • Base Layer – The Copper II finishes with 1” of high-density poly foam, which works to give the springs something off of which to rebound.
Sealy Hybrid Performance Copper Construction
Showing the layers of the Sealy Hybrid Performance Copper II


As you likely noticed, the Kelburn and the Copper feature nearly identical constructions, with soft foam top layers up top supported by a Tempurpedic pocketed coil system below.

However, in between all of their similar layers, each bed features a section that’s unique to them, as seen in either the Extra Soft Foam in the Kelburn or the Sealy Support Foam in the Copper. While seemingly insignificant, the addition of these layers helps to transform the mattresses into two unique models, with the Kelburn having a softer, deep sinkage feel while the Copper has just a bit more bounce.

Perhaps one of the most noticeable difference between the two beds is their price. While a Queen size Kelburn comes in at $1,300, a Copper Queen goes for a cool $1,600.

Sealy Hybrid Performance Tag


After taking a look at the constructions of these Sealy beds, let’s chat about their different firmness levels and feels.

Kelburn II

As I applied light force to the Kelburn II, I found that I was immediately interacting with the thick knit cover and the soft foams up top. My hand sank snuggly into the bed and I felt some quality pressure relief. Pushing in further, I began to experience the bounce of the mattress as I encountered the pocketed coil support system.

Copper II

Pressing into this bed with a little hand pressure, the first thing I felt was the contouring of the memory foam in the comfort layer. As I placed both hands on the mattress and added more force, I met the firmer transition layer and the pocketed coils, which lifted me up and out of the structure.

Sealy Hybrid Performance Hand Press Top
Pressing into one of the Sealy Hybrid Performance mattresses

Since folks of different sizes and body types are going to feel firmness differently, I decided to invite three other testers to help me figure out the firmnesses of these Sealy beds. We each stretched out on the two mattresses, decided on our individual firmness ratings, averaged them together and then compiled them on the graph below.

While feel is always going to be a personal thing, this will hopefully give you a better sense of the firmness you can expect from these beds!

Sealy Hybrid Performance Firmness
Firmness ratings for the Sealy Hybrid Performance Copper II and Kelburn II

Kelburn II

As you can see on the graph above, my testers gave the Kelburn II an average firmness rating of 6. When compared to the industry standard of 6.5 for medium firmness, it’s clear that this bed is just a touch below medium firm.

I personally gave the bed a 5 as I found its combination of gentle foams produced quite a soft feel. You’re likely to really sink into this structure, with the foams working to provide pressure relief at the shoulders and hips as well as along the spine. That being said, the pocketed coil system does do a good job of supporting the sleeper so you won’t feel too stuck in the mattress.

Copper II

Interestingly enough, my testers also gave the Copper II an average firmness rating of 6, which sets it as just a smidge below medium firm.

The bed got a 6 from me, as I found its extra transition layer brought some firmness to the mattress. While you’ll still sink into the Copper II for satisfying pressure relief, this section, coupled with the pocketed coil system, is going to curb some of this and place you more on top of the mattress than in it. I should note that I am lying on the Firm Copper II, so if you need something a bit softer, you can always opt for the Plush version.

Keep in mind that for a firmer feel overall, you’ll be best served by the Sealy Hybrid Essentials. Conversely, if you’re after a plush vibe, you might want to consider the Sealy Hybrid Premium. Regardless of the collection you go with, I’ve found that all of these Sealy Hybrid beds have a soft feel to them thanks to their thick layers of memory foam up top. If you’re a big fan of this classic mattress material, you’ll find a lot to love in any of these models.

Sealy Hybrid Performance Contour
Sinking into the comfort layer on the Sealy Hybrid Performance


Next up, we’re going to chat about these beds’ pressure, or more specifically where pressure points are likely to form while lying on top of them.

To give you an idea of where these tension spots might crop up, I placed a pressure map on top of each mattress and rested on my back, side, and stomach. You can see the results on the images below where pressure is represented from blue (low pressure) to red (high pressure).

Kelburn II

Sealy Hybrid Performance Kelburn II Pressure
The pressure map results for the Kelburn II. My legs were hanging off the bed for the back measurement, they didn’t disappear…

Back – Stretching out on my back, I felt as though my weight was evenly distributed across the surface. I could feel myself sinking pretty deeply into the layers of memory foam up top, which provided my lumbar region with some fantastic pressure relief. Given the slow response to pressure of all these materials, I did find it a tad difficult to move around the mattress.

Edge Support – Scooting close to the side, I felt extremely secure thanks to the additional layer of edge support coils in the Tempurpedic pocketed coil system. These springs lifted me up and out of the structure, allowing me to use the entire surface area of the bed. For this reason, I’d say the Kelburn II could make a great pick for anyone who sleeps with a partner.

Sealy Hybrid Performance Back
Lying on my back on the Sealy Hybrid Performance

Side – Turning onto my side, I felt a lot of great relief from this mattress. As I mentioned up top, I found this bed to have a firmness of about 5/10, which tells me it’s a pretty soft structure perfect for those who slumber on their sides. This is because gentler mattresses do a great job of cushioning the shoulders and hips, typical problem areas for side sleepers.

Stomach – Rolling onto my stomach, I began to experience some discomfort as my hips sank out of line with my shoulders. Stomach sleepers usually prefer firmer mattresses as they work to keep the spine in an even alignment, so I’d suggest these sleepers check out the Sealy Hybrid Essentials.

Copper II

Sealy Hybrid Performance Copper II Pressure
Showing the pressure map results for the Copper II version of the Sealy Hybrid Perfomance

Back – Lying on my back, I could really feel myself sinking into the mattress, which makes sense considering the 4.5” of gentle foam up top. As I sank into the structure, I could feel these materials filling in the space at my lumbar region for some nice pressure relief. In spite of this deep body contouring, I didn’t feel stuck in the mattress and found it easy to move around and change positions.

Edge Support – Scooting as close to the side as I could, I felt super secure. Like the other Sealy Hybrid mattress I’ve reviewed, the Copper II features an extra layer of edge support coils, which help to bolster the sleeper across the entire surface area of the mattress. For this reason, I think the Copper II could be a potentially great fit for couples.

Sealy Hybrid Performance Side
I tried out both the Copper II and Kelburn II for side sleepers

Side – Rolling onto my side, I continued to feel a lot of comfort from this mattress. Though this is the “Firm” version of the bed, I found it to still have a soft feel, thanks to the thick layers of memory foam up top. These materials hugged my shoulders and hips, providing them with excellent pressure relief. As these spots are typical problem areas for side sleepers, I’d say this bed could be great for those who doze primarily on their sides.

Stomach – As I landed on my stomach, I began to feel a bit of discomfort as my hips sank out of line with my shoulders. Stomach sleepers tend to prefer firmer mattresses that keep the spine in a nice, even alignment, so this bed might be a touch too soft for them. Instead, strict stomach sleepers should check out the firmer Sealy Hybrid Essentials.


In this next section, we’ll be taking a look at the Performance’s motion transfer, or the amount of disturbance detectable from one side of the bed to the other. While this test will be important to all sleepers, it’s especially relevant for those with a bed mate as it’ll let you know just how bothered you’ll be by their movements in the middle of the night.

To illustrate this motion transfer, I dropped a 10 lb. steel ball from heights of 4 inches, 8 inches and 12 inches and measured the disturbance it caused: the bigger the lines, the bigger the disturbance.

FYI: Each drop is meant to symbolize a different movement you’re likely to experience in bed, from tossing and turning (4”) to getting out of bed (8”) all the way to full on jumping (12”).

Kelburn II

Sealy Hybrid Performance Motion Kelburn
Motion transfer test results on the Kelburn II

These are pretty fantastic motion transfer results, which tell me that you shouldn’t be too bothered by your partner’s tossing and turning. The soft foams up top do an excellent job of dampening movement across the surface while the individually wrapped coils in the core help to disperse this motion even deeper into the structure.

Copper II

Sealy Hybrid Performance Motion Copper
I was pretty impressed with the results of the motion transfer test for both versions of the Sealy Hybrid Performance

As with the Kelburn II, the Copper II has really solid motion transfer. Though the addition of the transition support layer does make this a slightly firmer bed, the soft layers of foam work to target and absorb any movement along the surface.


When buying a new bed, most people want to know whether they’ll feel like they’re sinking “into” the mattress or laying “on top” of it.

To visualize this sinkage, I placed four balls of varying sizes and densities (a 6 lb medicine ball, a 10 lb steel ball, a 50 lb medicine ball, and a 100 lb medicine ball) on the Performance mattresses and measured how much they compressed the surface.

Kelburn II

Sealy Hybrid Performance Kelburn Sinkage
Performing the sinkage test on the Sealy Hybrid Performance Kelburn II
  • 6 lb medicine ball: 1.5 inches of sinkage.
  • 10 lb steel ball: 2.5 inches of sinkage.
  • 50 lb medicine ball: 4.5 inches of sinkage.
  • 100 lb medicine ball: 6 inches of sinkage.

This is quite a lot of sinkage, which isn’t that surprising when you consider the thick layers of foam that overlay the pocketed coil system. You’re likely to really sink into this bed as the materials contour to the curves of your body. That being said, you might feel like you’re more “in” the Kelburn than “on top” of it.

Copper II

Sealy Hybrid Performance Copper Sinkage
Checking the sinkage on the Sealy Hybrid Performance Copper II
  • 6 lb medicine ball: 1 inch of sinkage.
  • 10 lb steel ball: 2 inches of sinkage.
  • 50 lb medicine ball: 4 inches of sinkage.
  • 100 lb medicine ball: 5 inches of sinkage.

While featuring less sinkage than the Kelburn, the Copper II still boasts a lot of the stuff. You’ll likely sink through the comfort and contour layers for some pleasant pressure relief, but will find that the transition support layer and pocketed coil system keep you buoyed on top of the mattress.


Sealy Hybrid Performance Corner
The Sealy Hybrid Performance is the middle model of the Sealy Hybrid line
  • Purchase: Sealy doesn’t sell directly to the consumer, but interested buyers can purchase through Sears
  • Trial Period: 180 days, but must try it for at least 30 days.
  • Warranty: 10 years.
  • Shipping: Sears offers free shipping on orders over $599.

Just getting started? Begin your mattress search with my mattress reviews breakdown.


If you’re convinced one of these Sealy Hybrid Performances is the right mattress for you, the size and pricing information for the beds are below. Please note that these prices reflect standard pricing at time of publication.

SizeDimensionsKelburn IICopper II
Twin XL39.5" x 79.5" x 14"$1,275$1,575
Full54.5" x 74.5" x 14"$1,279$1,580
Queen60.5" x 79.5" x 14"$1,300$1,600
King76.5" x 79.5" x 14"$1,800$2,100
Cali King72.5" x 83.5" x 14"$1,800$2,100


Now that we’ve looked at these two Sealy Hybrid Performances side by side, let’s take a moment to go over some general pros and then a few cons so you can figure out which one is right for you:


  • One of my favorite things about the Sealy Hybrid Performances is that both models feature memory foam that sleeps cool. This means you’ll get to have all the great body contouring of the classic material without any of its pesky overheating.
  • I also think the two models could make fantastic beds for couples as they both have excellent edge support and motion transfer.

Kelburn II

  • In my opinion, the standout feature of the Kelburn is its softness, intended to provide the sleeper with some awesome pressure relief.

Copper II

  • While the Kelburn might be a good pick for side sleepers, I think the Copper II could make a great choice for combo sleepers as the mixture of gentle foams and pocketed coils make it easy to change positions.


  • Though the combination of feels here should satisfy a wide range of sleepers, stomach sleepers may not feel totally comfortable on either of these beds. Instead, they might want to check out the Sealy Hybrid Essentials, which has a firmer feel.
  • Also, if you’re not a big fan of the deep sinkage you’d get from memory foam, you may not be totally satisfied by the Sealy Hybrid line, which features the foam in all of its mattresses.

Click the link for more information on the Sealy Hybrid Performance Copper II and Kelburn II from Sears!

Sealy Hybrid Performance Front
The Sealy Hybrid Performance Mattress
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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.
Logan Block

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