Sealy Posturepedic Plus Prosser Hills Review

In This Review
Performance Tests | Firmness | Support & Sleeping Positions | Design | Materials | Comparisons | FAQs

At NapLab, we put each mattress to the test.

We test 10 different factors that impact the performance, comfort, and feel of the mattress. We then take the results of those tests and compare them to every mattress we’ve tested to date.

Check out the full performance table below to see how this mattress ranks:

Factor	Sealy Posturepedic Plus Prosser Hills	Average
Overall Score	8.41	8.53
Price (Queen)	$799	$976 (Coil only)
Cooling – Score	9.0	8.6
Sinkage – Depth	1.76″	2.23″
Sinkage – Feel	Minimal	Moderate
Motion Transfer – Score	10	8.2
Motion Transfer – Acceleration	4.84 m/s²	8.79 m/s²
Response Time – Score	9.9	8.8
Response Time – Mostly Recovered	0.2 sec.	0.4 sec.
Response Time – Fully Recovered	0.4 sec.	1.0 sec.
Bounce – Height	9.37″	8.77″
Bounce – Feel	Moderate	Moderate
Edge Support – Score	10	8.7
Edge Support – Sitting	2.50″	3.94″
Edge Support – Lying	Outstanding	Good
Sex – Score	8.5	8.2
Pressure Relief – Score	6.0	8.6
Comfort Layer Thickness	3.75″	4.28″
Mattress Thickness	12.75″	12.18″
Off-Gassing – Score	8.1	8.0
Off-Gassing – Smell	Strong	Strong
Off-Gassing – Days	7 days	7 days
Company – Score	6.6	8.8
Trial	0 nights	181 nights
Warranty	10 years	41% have lifetime warranties, average of other 59% of mattresses is 13 years

How is Sealy Posturepedic Plus Prosser Hills Different?

The Sealy Posturepedic Plus Prosser Hills is a 12.75″ coil mattress with an overall performance level that is slightly below average and a price tag that is also below average.

Advantages

Aside from the low price, other advantages to the Prosser Hills coil mattress include better cooling, low levels of motion transfer, fast material response time, and excellent edge support.

Sex performance is also slightly better than average.

Neutral Factors

As neutral factors, this mattress has minimal sinkage and moderate levels of bounce. For side sleepers, the restrained sinkage could be seen as a disadvantage.

Disadvantages

Downsides to the Prosser Hills mattress include disappointing pressure relief, only scoring a 6.0 out of 10 in our tests. It has a 3.75″ comfort layer, which is over 1/2″ thinner than the average comfort layer.

Additionally, this mattress is only available via Costco, so you’ll need a membership to purchase this mattress.

The Sealy Posturepedic Plus Prosser Hills has excellent cooling. During our tests, I did not feel any significant level of heat retention around my body.

While this mattress does have a fairly thick foam comfort layer, the foam types it’s using all seem to breathe fairly well. In addition, the Prosser Hills mattress is equipped with a thick 8.0” coil unit, which helps to improve breathability and airflow.

• Baseline Temperature – the temperature of the mattress before anyone lies on it
• Maximum Temperature (0 minute) – the temperature of the mattress after lying on it for 15 minutes
• Ending Temperature (5 minute) – the temperature of the mattress after being lied upon and having no one on it for 5 minutes

According to the product page, this mattress also utilizes a cooling cover. However, during our tests, I did not feel any notable cooling from the cover. The cover feels like any other fairly standard fabric.

In our objective temperature tests, we measured a max surface level temperature of 90.3° F. This is 0.3° warmer than the average of 90.0° F, based on all of our tests to date.

After getting off the mattress, the temperature declined by 4.5 degrees from minutes 0 to 1, which is 0.3 degrees less cooling than the average 0 to 1 minute decline of 4.8 degrees.

When we consider the combination of objective data, my subjective experiences, and an analysis of the materials, I’m confident in my view that cooling is excellent.

The Sealy Posturepedic Plus Prosser Hills has minimal sinkage. During our tests, we measured a pressure point sinkage depth of 1.76″. This is 0.47″ less sinkage than the average sinkage depth of 2.23″, based on all of our tests to date.

The level of sinkage is documented in the image below.

The mattress creates a very slight level of body contouring hug. This mattress is so incredibly firm and has so much push back that there is just no real contouring feel at all around the body.

The body lies more “on” the mattress as opposed to sinking down “in” the mattress. The combination of minimal sinkage, very slight contour, floating feel, and extra firm feel creates an incredibly polarizing feel.

While some sleepers may enjoy this feel in the firm version, it’s not one that a majority of sleepers will prefer, in my view. The vast majority of sleepers should go with the plush version of this mattress, which, based on my experience with the firm version, will be far less polarizing and a more balanced sinkage, contour, and comfort dynamic.

The Sealy Posturepedic Plus Prosser Hills has an extremely low level of motion transfer. During our tests, we measured a total acceleration range of 4.84 m/s².

This is 45% less motion transfer than the average of 8.77 m/s². I was quite surprised at the below-average level of motion transfer.

Typically, firmer mattresses create more motion due to the higher level of bounce that comes with the increase in firmness. However, that’s not what we measured here.

Sealy is using a fairly unique and unusual coil design within this mattress. It’s one I haven’t seen anything quite like it used elsewhere. My best guess is that this novel coil design, which is supposed to improve support, also has the side benefit of isolating motion better.

The level of motion transfer is also documented in the video below.

In our motion transfer chart, which visualizes our accelerometer data, we can see the highest motion peaks from 0 to 0.2 seconds.

Motion declines thereafter, but we do see a modest secondary energy spike from 0.5 to 0.6 seconds.

By 1.17 seconds, we’ve returned to near-zero levels of energy, which is 0.28 seconds longer than the average motion duration of 0.89 seconds.

While the motion duration is longer than the average, the motion intensity is well below average. Overall, I’m pleased with this level of motion and don’t expect it will be a problem for most sleepers.

The Sealy Posturepedic Plus Prosser Hills is a mixed bag for material responsiveness, with an extremely fast mostly recovered response time and a very fast fully recovered response time.

In our mostly recovered test, we measured a recovery speed of 0.2 seconds, which is 0.21 seconds faster than the average of 0.41 seconds, based on all of our tests to date.

In our fully recovered responsiveness test, we measured a recovery speed of 0.4 seconds, which is 0.62 seconds faster than the average of 1.02 seconds. While this isn’t quite the fastest material recovery speed we’ve tested, it’s very close.

The level of responsiveness is documented in the video below.

The combination of extra firm feel and floating feel with minimal body contour helps make this mattress super easy to move around on.

When you don’t sink down very far into the mattress, you set the stage for incredibly fast material recovery speeds and excellent ease of movement. All that to say, this is effectively an instant material recovery speed.

The Sealy Posturepedic Plus Prosser Hills has a moderate level of bounce. During our tests, we measured a total bounce height of 9.37″. This is 0.58″ more bounce than the average of 8.79″, based on all of our tests to date.

Typically, coil mattresses have more bounce than average and that’s exactly what we measured here. The combination of a tall 8.0” coil unit, firm feel, and minimal sinkage are all working together to create a higher level of bounce than average.

The level of bounce is also documented in the video below.

That extra bounce helps improve ease of movement and is also beneficial for sex performance.

Typically, more bounce also means motion transfer is worse and yet, Prosser Hills also managed to keep motion transfer levels lower, most likely due to the novel coil design.

The Sealy Posturepedic Plus Prosser Hills has outstanding sitting edge support and outstanding lying edge support.

In our sitting edge support test, we measured a sitting sinkage compression of 2.50″. This is 1.44″ less sitting sinkage than the average of 3.94″, based on all of our tests to date.

The level of edge support while seated is documented in the images below.

While lying directly on the edge of the mattress, I felt that the support was outstanding in all sleeping positions. This mattress has such fantastic edge support due to a combination of extra firm feel and minimal sinkage.

In addition, this mattress is equipped with reinforced edge support coils that run along the entire perimeter.

The level of edge support while lying is documented in the images below.

This combination of design and material choices works together to create robust support at the edge for both sitting and lying.

The Sealy Posturepedic Plus Prosser Hills has good sex performance. On the positive side, edge support is outstanding.

With just 2.50” of sitting edge sinkage, the edge is incredibly supportive and a usable part of the mattress for amorous activities. In addition, cooling performance was also excellent.

With a middling performance, we have bounce, which we measured at 9.37”. While this is more than average, it’s not that much more.

When it comes to bounce, more is almost always better and the relatively limited level of bounce means that sex performance is good, but not incredible.

Moving on, we found that this mattress created a moderate level of noise. Seemingly, the lack of higher-quality foam seems to be creating a little more noise with the coil unit.

Sex Factor	Factor Weight	Score	Rating
Bounce	65%	8.3	High
Edge Support	20%	10	Outstanding
Noise	5%	8.0	Moderate
Pressure Relief	5%	6.0	Mediocre
Cooling	5%	9.0	Excellent

In our tests, it was squeaking and making more noise than we typically experience.

Last but not least, we have pressure relief, which earned a below-average score with a mediocre rating. Despite the shortcomings for pressure relief, this overall amorous activity performance is solid.

The Sealy Posturepedic Plus Prosser Hills has a mediocre level of pressure relief. During our tests, I felt a moderate level of pressure points building on my body.

In general, I found the mattress fairly uncomfortable, especially while lying in the same position for any extended duration of time.

The mattress is equipped with 3.75″ of comfort material, which is 0.54″ less comfort material than the average comfort layer thickness of 4.29″, based on all of our tests to date.

The combination of extra firm feel, extremely high degree of pushback, floating feel, and foam quality are all working together to create problems for pressure relief.

The material quality is incredibly disappointing. While we do have a reasonably thick comfort layer at 3.75”, the foam looks and feels low quality, both on the body and in-hand.

There is a notable “crunchiness” to these foams, which is typically something we only see in foams that are dried out and at the end of their useful life. Just running a finger across the foams, you can feel and hear how dry they are. This is not the first time we’ve seen this type of lower-quality “crunchy” foams from Sealy.

We noted a similar foam quality and pressure relief issues with Sealy’s Posturepedic Spring, Posturepedic Hybrid, RidgeCrest II, Carver, and Plus Hybrid models.

Beyond the fact that these foams are not especially comfortable, my chief concern with the foam quality is simply longevity. I don’t expect this mattress to last especially long, given the comfort foams that it utilizes.

Pressure Relief (PSI)	Average	Maximum
Side Sleepers	0.10	0.50

Pressure Relief (PSI)	Average	Maximum
Back Sleepers	0.08	0.79

Pressure Relief (PSI)	Average	Maximum
Stomach Sleepers	0.09	0.73

In our objective pressure mapping tests, we measured a max PSI of 0.79. This is within the 1.0 PSI threshold that we want to see.

When I consider our objective pressure mapping tests, material thickness, material quality, and my subjective experience on the mattress, I’m confident most sleepers will find the pressure relief to be mediocre.

The Sealy Posturepedic Plus Prosser Hills had a strong smell upon the initial arrival. The mattress smelled for 7 days. This is 0.2 days shorter than the average smell duration of 7.2 days.

The Sealy Prosser Hills mattress is exclusively sold at Costco. Shipping and returns are both free and the mattress is backed by a 10-yr warranty.

Company Factor	Factor Weight	Score	Data
Returns	40%	10	$0
Trial Period	30%	0	0 nights
Warranty	20%	8.0	10 years
Shipping	10%	10	$0
Country of Origin	0%		USA

Comparing 103+ brands tested to date, the average trial period is 175 nights. While Costco does boasts a generous return policy, this isn’t really the same as a trial period.

Regarding the warranty, the average warranty is 14 years, which is 4 years more than this mattress, and that’s if we exclude the 42% of mattresses that offer lifetime warranties.

The Sealy Posturepedic Plus Prosser Hills is available in two firmness levels, firm and plush. We tested the firm version and found it to be a 9 out of 10 on our firmness scale with an extra firm feel.

Firm Version

Plush Version

Based on this data, I would estimate the Plush version to be closer to 6 out of 10, with a medium-firm feel.

Support on the Sealy Posturepedic Plus Prosser Hills is mediocre. During our tests, I felt that support really missed the mark here. While the mattress is supportive enough for back and stomach sleepers, it is also incredibly uncomfortable and lacks pressure relief.

Support Factor	Data
Comfort Layer	3.75″
Support Layer	9.00″
Firmness	Medium-Firm and Extra Firm
Body Contour	Slight
Zoned Support	Yes
Reinforced Edge	Yes

For a mattress to create ideal support, it needs to both support the body, while also creating sufficient pressure relief and comfort. This mattress simply doesn’t create sufficient pressure relief.

As a result, I was unable to lie comfortably in the same position for extended periods of time. The mattress is equipped with a 9.0″ support layer. This is 1.1″ thicker than the average support layer thickness of 7.9″, based on all of our tests to date.

Moving on, the Prosser Hills mattress simply has such a polarizing degree of minimal sinkage, floating feel, and extra firm feel that it is going to create comfort and pressure relief issues for many sleepers.

The sleeper who will enjoy this mattress will prefer the extra firm feel, minimal sinkage, and a floating feel. Some back and stomach sleepers could find that this support dynamic matches their preferences well.

However, I would strongly recommend side sleepers avoid the firm version of this mattress. Side sleepers will do much better with the plush version.

In my view, most sleepers will strongly prefer the plush version of this mattress. The firm version is simply so firm that it’s not as good of a fit for the vast majority of sleepers, in my view.

Check out the table below to see the sleeper weights and sleeping positions that would be best suited for this mattress.

Plush Version

Sleeper Weight	Stomach Sleeper	Side Sleeper	Back Sleeper
Under 150 lbs.	Yes	Yes	Yes
150-250 lbs.	Yes	Yes	Yes
250-300 lbs.	Yes	Yes	Yes

Firm Version

Sleeper Weight	Stomach Sleeper	Side Sleeper	Back Sleeper
Under 150 lbs.	Yes	No	Yes
150-250 lbs.	Yes	No	Yes
250-300 lbs.	Yes	No	Yes

Lastly, I think this mattress uses zoned support, though I am not 100% certain. The product page says it is equipped with “PrecisionFit™ Coils [that] Flex to Your Body to Maintain Natural Alignment”.

Beyond the graphic of the layers on the product page, which shows a blue set of coils in the middle, there is no explicit description on whether or not this mattress uses zoned support. This mattress uses 966 coils in a Queen size.

Based on all of my tests to date, an analysis of the materials, and my subjective experiences, I’m confident that most sleepers will find support on the Sealy Posturepedic Plus Prosser Hills to be mediocre.

The Sealy Posturepedic Plus Prosser Hills is a 12.75″ coil mattress that comes in two firmness options—Plush and Firm, although the exact firmnesses end up being firmer than the names suggests.

The thickness also has some variety, as the manufacturer puts the Firm version at 12″ thick and the Plush version at 13.5″ thick.

The particular model is a Costco exclusive, solely available for Costco members.

Design Factor	Data
Type	Coil
Thickness	12.75″
Cover Type	Quilted
Weight	90 lbs.
Has Handles	Yes
Fiberglass-Free	Yes
Ships in a Box	No

The Sealy Posturepedic Plus Prosser Hills is 12.75″ thick and contains a combination of different foam types and a coil base. From top to bottom, here is a full list of the materials used in this mattress:

Layer Type	Thickness	Layer Specs
Quilted Cover	1.25″	Not Available
Poly Foam	2.50″	Not Available
Pocketed Coils	8.00″	Not Available
Support Foam	1.00″	Not Available

The Sealy Posturepedic Plus Prosser Hills has a quilted cover with a striped design and organic red accents. It has quilted tufted accents, but overall, the cover is not heavily contoured or extremely plush.

The comfort layer is 3.75″ thick and made of a 2.5″ poly foam layer. This foam sits directly below the cover and serves as the primary comfort material before engaging with the support layer.

The support layer is 9.00″ thick and made of 8.0″ pocketed coils and a 1.0″ support foam base. The coils are zoned throughout the foot, mid-section, and head of the mattress, as well as also providing reinforced coils at the edge of the mattress.

Product Evolution

The Posturepedic Plus Prosser Hills was launched in 2025, and since its release, there have been no major changes made to the design of the mattress.

Prosser Hills is part of Sealy’s revamped mattress collection for Costco. The new Sealy Costco series includes:

• Sealy Posturepedic Pplus Prosser Hills
• Sealy Posturepedic Pro Highland Manor
• Sealy Posturepedic Pro Lincoln Heights
• Sealy Icon

These 4 mattresses replaced the now discontinued Sealy lineup from Costco, which included:

• Sealy Posturepedic Carver
• Sealy Posturepedic Plus Mount Auburn
• Sealy Plus RidgeCrest II

Other Mattresses to Consider

Not sure if the Sealy Posturepedic Plus Prosser Hills is the right pick for you? Check out these three other top-rated coil mattresses for alternatives you may want to consider.

Frequently Asked Questions

Still have questions? Check out some of the top FAQs on the Sealy Posturepedic Plus Prosser Hills mattress below and get the answers you’re looking for.