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Eight Sleep Mars+ Mattress Review (2019 Update)

Last updated on June 22, 2022

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As of May 2019, the Eight Sleep Mars mattress has been discontinued. Be sure to check out our in-depth review of its replacement, the Pod (see link below).

Short on time? Click here to jump down to the review summary

Note: The Eight Sleep Mars mattresses has been discontinued. Eight's revamped lineup now consists of two new models: The more basic Smart Bed is an all-foam bed that includes a separate sleep tracker/heated mattress cover. The higher-end Pod mattress is an all-foam bed with an integrated sleep tracker and fluid-based temperature control system which can both heat and cool the bed. Be sure to see our in-depth review of the Eight Pod.

Take our Mattress Match Quiz to see how these new Eight Sleep mattresses fit your needs and preferences. 

Table of Contents

Nobody does more in-depth mattress reviews than GoodBed — which means there's a lot of information here! Use the links in this table of contents to quickly jump to the sections of this review that interest you most.

Summary Overview of GoodBed's findings and conclusions about this product
Materials & Construction Mattress Type, Layers, Cover, Sleep Tracker
Comfort & Feel Ratings Softness, Cushioning Depth, Memory Feel, Bounce
Back Support + Pressure Relief Ratings By sleeper weight and sleep position
Feature Ratings Motion Isolation, Temperature, Edge Support, Ease of Repositioning, Natural vs Chemicals, Adjustable Base Compatibility
Price, Value & Longevity Cost, Durability, Overall Value
Other Factors to Consider Delivery, Returns, Warranty
Bottom Line Who is the best/worst match for this mattress?

Summary: Is the Eight Sleep Mars+ a Good Mattress?

Note: The Eight Sleep Mars+ has been discontinued, and Eight Sleep now sells two different mattresses, the Pod and the Smart Bed, both of which include sleep-tracking technology.

The Eight Sleep Mars+ mattress is a hybrid bed, made with layers of foam and synthetic latex over a support unit of pocketed coils. It's a construction that's fairly easy to find these days. But the Mars+ mattress is just the beginning: it's paired with Eight Sleep's Sleep Tracker, which slips on to the mattress in the same way you might put on a mattress protector. The sleep tracker was featured in a very successful Kickstarter campaign, and was developed in advance of the Mars+ mattress. The sleep tracker pairs with an app, which you can use to view data, monitor heart rate and nighttime breathing, and even control temperature -- you can use the sleep tracker as a heat blanket to warm up your mattress.

The Mars+Sleep Tracker system sells for $1,399 in queen size; the tracker itself sells separately for $399, so the mattress's price is competitive with other latex and coil beds. So if you're interested in tracking your sleep patterns for health reasons, to improve athletic performance, or just for the sake of curiosity, the Eight Sleep Mars+ is a good value.

We put the Mars+ mattress through our standard battery of sleep and comfort tests. We found the Eight Sleep bed to be well suited for our tester in  the three major sleeping positions, offering good support for back, stomach, and side sleeping.

Since the Mars+ has a pocketed coil support system, it has some bounce; that can sometimes affect motion isolation, but here the pocketed coils are well isolated and function independently -- practically speaking, that means we noted very little motion transfer from one side of the bed to the other.

Other highlights in our testing were good edge support and excellent ease of movement.

But the real story here is the mattress/sleep tracker combo. If you aren't particularly interested in analyzing your sleep data, then a number of other hybrid mattress compete directly with the Eight Sleep Mars bed on both materials and price. But as a sleep system, the Mars+ competes mainly with it's sister mattress, the Jupiter+ all-foam bed, which is less expensive.

Read on for our detailed report and be sure to check out the video to see this mattress in action as we put it through our tests.

Bottom Line: Who is the Best Match for an Eight Sleep Mars+ Mattress?

BEST if you:

  • Sleep in a variety of positions
  • Move around and reposition frequently
  • Enjoy a buoyant feeling of floating on top of the mattress
  • Are easily disturbed by a partner's movements
  • Want to monitor and track sleep data

NOT IDEAL if you:

  • Prefer a slow, melting into the bed feeling
  • Need the best pressure relief
  • Don't care about tracking your sleep quality

 Eight Mars+

Comfort & Feel

These are the "preference-based characteristics" of a mattress. No classification here is better or worse – they are strictly a matter of your personal preference.

Softness Level
(1=Least Soft, 9=Most Soft)
4 Medium Firm
Cushioning Depth
(1=Shallowest, 9=Deepest)
5 Medium
Response Rate
(1=Slowest, 9=Fastest)
8 Quick recovery, a little bounce


Back Support (by Sleeper Type)

No mattress will provide equally good spinal alignment (a.k.a., back support) for every sleeper. Here's what to expect in terms of spinal alignment on this mattress – by sleeper weight and sleep position.

Weight Range Back Sleepers Side Sleepers Stomach Sleepers
Lighter <150 lb 9 8 9
Average 150 to 200 lb 9 8 9
Above Average 200 to 250 lb 9 8 9
Heavier >250 lb 9 8 9


Pressure Relief (by Sleeper Type)

The pressure relief offered by a mattress – especially important for side sleepers – will vary based on a sleeper's weight and body shape. Here's how we size up the pressure relief capabilities of this mattress.

Weight Range Typical Curves Extra Curvy
Lighter <150 lb 8 8
Average 150 to 200 lb 8 8
Above Average 200 to 250 lb 7 7
Heavier >250 lb 6 6


Other Features

These are the "priority-based characteristics" of a mattress. Ratings here indicate where this mattress has strengths or weaknesses – however the importance of these features will depend entirely on your personal priorities.

Motion Isolation 8 Very good
Stays 'Cool' 7 Good
Edge Support 8 Very good
Ease of Repositioning 10 Exceptional
Green Features 5  Does have some safety certifications
Overall Value 8 Very good value

Key Facts

Mattress Type:

Synthetic Latex over Pocketed Coils

Price (Queen)



Free delivery

Return Policy

100-day trial, full refund and pickup


10 years (1 year on tracker): 1" indentation coverage

Country of Manufacture

United States


11 inches

Weight (Queen)

80-90 pounds



Materials & Construction

Mattress type:  Synthetic Latex over Pocketed Coils

Made In:  United States

Mattress Thickness:  11”

Mattress Weight:  80-90 pounds (queen size)


What's in an Eight Sleep Mars Mattress?

Overall, we classify the Jupiter mattress as a "Synthetic Latex over Pocketed Coils" construction type. It is an 11″ thick mattress comprised of 4 layers (listed below from top to bottom):

  • 2" synthetic latex
  • 2" polyurethane transition foam, 1.8 lb. density
  • 4" pocketed coil unit
  • 3" polyurethane foam, 1.8 lb. density

The Eight Sleep Mars+ mattress features a 2" layer of synthetic latex on top. While not natural, this layer has the same pressure relieving and support qualities as natural latex. Under that is a layer of standard polyurethane foam, followed by a 4" layer of individually-pocketed coils. The lowest layer is another 2" of polyurethane foam.

In addition to the mattress's layers, the bed has a perimeter of foam surrounding the pocketed coil unit as edge support.



The four layers of the Eight Sleep Mars+ mattress are wrapped in a soft and stretchy cover. Note that the Sleep Tracker then goes on top of the mattress cover.


Sleep Tracker

The "plus" sign in "Mars+" is for the included Sleep Tracker, the big selling feature from Eight Sleep. The tracker has several components. The 'receiver' that collects your data comes as a series of sensors embedded in a mattress cover that installs right on top of the Mars mattress (it goes on just like a mattress pad). You can see the wires and sensors in the cover, but our tester could not feel them at all. The top part of the cover unzips and is washable.

Eight Mars+

The mattress pad/sensor plugs into a small receiver unit, which in turn connects to an app, which serves as your dashboard and main interface for the sleep data that's collected, and also serves as a controller for the Sleep Tracker. For example, you can use the tracker as a heating pad, and set the app to start warming the bed at a certain time. You can even control both sides of the bed independently.

Eight Mars+

What can you  track with the Sleep Tracker? It can monitor your sleep, and tell when you are sleeping soundly or fitfully. It can tell you how often you wake up, your heart rate and respiration rate. It tracks total sleep time, and knows how long it took you to fall asleep. Based on the data, the app can make recommendations to improve your sleep quality. It can connect and sync with many other applications and trackers, and can be use to program the Sleep Tracker as a heating blanket.

Comfort & Feel

There are three aspects that make up our assessment of comfort and feel. We call these "preference-based characteristics" because no rating here is better or worse – rather, the attributes that are most desirable to you will be determined solely by your personal preferences. We apply the same classification standards to each mattress so you can more easily compare apples to apples.

Softness ( what’s this )

Keep in mind that what mattress companies call “firm” or “soft” is a purely a preference. All mattresses should be supportive and promote healthy spinal alignment. Whether a mattress is fluffy and squishy (what mattress companies call soft or plush), or less so (what companies call firm), is purely down to your personal needs and preferences.

We classify the Mars+ as a medium firm mattress

Not sure what softness is best for you? Take our Mattress Match Quiz and find out.

Softness Level
(1=Least Soft, 9=Most Soft)
4 Medium Firm


Cushioning Depth ( what’s this )

This refers to how deeply you sink into the mattress or feel cradled or hugged, versus a feeling of floating on top of the bed. This is definitely more of the latter. When we place our 16-lb. bowling ball atop the mattress, it did not sink in as much as it did with some of the other mattresses we’ve recently tested. And our tester, lying on top of the bed, felt cushioning was a bit shallower than some competing mattresses with deep pillowtops and plush top layers.

The Mars+ mattress has what we would term medium cushioning -- average among mattresses, but giving you a big more of a floating feeling as opposed to sinking in deeply.

Cushioning Depth
(1=Shallowest, 9=Deepest)
5 Medium


Responsiveness ( what’s this )

Responsiveness refers to how quickly a mattress recovers its shape after being compressed. When you press your hand into the mattress, for instance, then remove it, does it take several seconds for the mattress to return to flat, or does it recover immediately?

The Eight Sleep Mars+ mattress does not contain any memory foam, so it's no surprise we did not note any of that slow, melting into the bed sensation you get with memory foam. Rather, the bed springs back into shape very quickly.

We also tested bounce;  the pocketed coils in this mattress pushed our tester back into the air when he dropped his weight on the bed, so if you like a mattress with some bounce, the Mars+ has it.

Response Rate
(1=Slowest, 9=Fastest)
8 Quick recovery, with some bounce


Back Support & Pressure Relief

The two things that you should always be sure to get from your mattress are spinal alignment (commonly thought of as "back support") and pressure relief. Unfortunately, no mattress will deliver these two things equally well for all sleepers. In particular, spinal alignment and pressure relief capabilities will vary across sleepers with different weights, body shapes, and sleep positions. To help you determine how this mattress will perform for you, we break down our spinal alignment and pressure relief assessments by sleeper type.

In our evaluations, the Eight Sleep Mars+ mattress performed well in all sleeping positions for our tester. If you sleep in a variety of positions, or your partner sleeps in different positions that you, the Mars+ might be a good choice. We tested the Mars+ hybrid mattress and the Jupiter+ all-foam bed at the same time, so our observations contrast between the two. Generally, they are more similar than different.

Spinal Alignment

The key to good back support is maintaining proper spinal alignment while you sleep. This means that the mattress should hold your spine in roughly the same position it's in when you're standing. The ability of a given mattress to do this will generally depend on your weight, sleep position, and body shape.

Here is how we break down the spinal alignment of the Eight Sleep Mars+ mattress.

Weight Range Back Sleepers Side Sleepers Stomach Sleepers
Lighter <150 lb 9 8 9
Average 150 to 200 lb 9 8 9
Above Average 200 to 250 lb 9 8 9
Heavier >250 lb 9 8 9


Back Sleepers:

While our tester was on his back, he noted that his hips sank just deeply enough to create a perfectly neutral spine, while he felt the mattress did a nice job reaching up to support his lumbar curve. We feel that sleepers of a wide weight range would have a similar experience, and we did not have concerns that heavier sleepers might not be supported enough.

We found this to be true for both the Mars+ and the Jupiter+ mattresses, though our 200-lb. tester did have a preference for the firmer hybrid bed (the Mars+).

Side Sleepers:

For side sleeping, our tester also felt the Mars+ was supportive. He felt his shoulder sinking into the mattress enough to create good spinal alignment. He did feel that pressure relief was a bit better on the all-foam Jupiter+ mattress, but both mattresses performed well. If you are mainly a side sleeper, you might want to also see our review for the Eight Sleep Jupiter+ mattress.

Stomach Sleepers:

Achieving good spinal alignment for stomach sleepers can often be trickier as the hips can tend to sink down too far with some mattresses, but our tester felt well supported in this position as well. For those who sleep primarily on their stomachs, our tester preferred the Mars+ over the all-foam Jupiter+ mattress.


Pressure Relief

When a mattress pushes back against your body with too much force in a concentrated area, the result can be pain, soreness, loss of circulation, excessive tossing, and other problems. In general, such "pressure points" are of greatest concern for side sleepers, since that's the position in which your body's weight is distributed over the smallest surface area. To find the right mattress for your needs, keep in mind that the pressure-relieving capabilities of any given mattress will vary depending on the sleeper. Factors like your weight and body shape (e.g., broader shoulders and/or hips) will determine how far you sink into the mattress, and the pressure relief offered by that mattress will vary widely at different depths.

Here's how we sized up the pressure relief of the Eight Sleep Mars+ mattress:

Weight Range Typical Curves Extra Curvy
Lighter <150 lb 8 8
Average 150 to 200 lb 8 8
Above Average 200 to 250 lb 7 7
Heavier >250 lb 6 6


Overall, we found the pressure relief offered by the Eight Sleep Mars+ mattress to be good, but if you have experienced joint issues in the past, or are concerned about hot spots or pressure points, especially if you are a heavier individual, see our review for the Eight Sleep Jupiter+ all-foam mattress.


Other Features

Beyond the preference-based characteristics of comfort and feel, and the body matching for spinal alignment and pressure relief, a mattress will have a number of other attributes that can make it a better or worse choice for you. We call these "priority-based characteristics" because they are areas in which a mattress can be better or worse, but that will have differing amounts of importance to each sleeper. So, determining how much importance to give to these features will be entirely a matter of your own personal priorities. As always, we apply the same ratings standards to each mattress so you can more easily compare apples to apples.


Motion Isolation ( what’s this )

With a bowling pin standing upright on the Eight Sleep Mars+ bed, we tested motion isolation by dropping a 16-lb. bowling ball on it, as well as the whole weight of our 200-lb. tester.

In both tests, the bowling pin wiggled a bit but never fell. That's impressive for a mattress that includes coils, but because this bed uses pocketed coils, each spring moves independently, limiting motion transfer.

We felt that the Mars+ bed would be a good choice for couples who don’t want to feel their partner getting in and out of bed.

Motion Isolation Rating 8 /10 Good


Temperature ( what’s this )

For most people, we do not think the Mars+ mattress will feel hot. Because of the spring support layer, the mattress has more natural air flow than an all-foam bed, even though there's four inches of foam on top of the springs. If you have a known issue with sleeping hot, you might consider a mattress with less foam, but for most people, we do not think the Mars+ mattress will feel hot.

Stays 'Cool' Rating 7/10 Good


Edge Support ( what’s this )

If you like to sit on the edge of your bed, or if you tend to sleep right on the edge of your mattress, edge support will be an important preference factor for you. The Mars+ mattress does have a foam edge support all the way around the bed. When our tester sat on the edge, he sunk down quite a lot, but he didn't feel unstable. When laying on the edge, he felt himself starting to lean a bit, but again, did not feel unstable.
If you need the very best edge support, other hybrid mattresses have done better in our tests, but the Mars+ was very good, if not the best
Edge Support Rating 8 /10 Very good


Ease of Repositioning ( what’s this )

One of the highlights of the Eight Sleep Mars+ mattress, for our tester, was ease of movement, which owing to its high responsiveness, was almost effortless. If you tend to change positions a lot, the Mars+ mattress performed extremely well in our view.

Repositioning Rating 10 /10 Exceptional


Green Features ( what’s this )

For mattress shoppers concerned with the use of natural materials, sustainable manufacturing practices or the like, we offer our subjective evaluation of any efforts taken by the company to make the mattress more green, healthy, or safe. 

In the case of Eight Sleep, the company makes no claims about the use of natural materials, and is up front that its latex foam is synthetic. All of the foams used are certified to the CertiPUR-US standard, which verifies that a material has low VOC off-gassing as well as a lack of chemicals and other substances regulated by the CPSC.

Green Rating 5 /10 Does have some safety certifications


Adjustable Base Compatibility ( what’s this )

We did not specifically test the Eight Sleep bed with an adjustable base. However, the company does say that it can be used on one, and it does sell an adjustable base.


Price, Value & Longevity

How Much Does a Mars+ Mattress Cost?

Prices shown are list prices. Remember that GoodBed keeps our site current with the best available discounts on all online mattresses, many of which are exclusive discounts for our readers. 

Note: These are the last selling prices prior to the Mars being discontinued.

Size Dimensions Mattress


Full (Double) 54" x 75" x 11" $1,299 $275
Queen 60" x 80" x 11" $1,399 $250
King 76" x 80" x 11" $1,599 $325
California King 72" x 84" x 11" $1,599 $325


What Are You Getting?

The Eight Sleep Mars+ is an 11-inch mattress made of layers of synthetic latex and polyurethane foam, with a support layer of pocketed coils.  But the big story is the included Sleep Tracker, which transmits sleep data to an app, which serves as a dashboard and controller for the tracker. Each side of the bed can be tracked independently, and the tracker can also be used as a heated blanket. The app can be set to start warming the bed at a designated time.

How Long Will the Mars+ Mattress Last?

When it comes to estimating the comfort lifespan of a mattress, we tend to use foam density as our best, albeit imperfect, predictor of how long a foam will retain its shape and resiliency. For the Eight Sleep Mars+ mattress, the top layer of synthetic latex is of 3 lb. density. That's about average for mattresses in this price range. The other foams are 1.8 lb density, typical for support foam. Pocketed coils have a solid reputation when it comes to longevity. Overall, we don't see any obvious red blags when it comes to durability.


Overall Value

If we consider just the Eight Sleep Mars mattress, without the sleep tracker, and subtract the $399 price of the sleep tracker from the Mars+ system, we end up with a $999 hybrid mattress. Among online mattresses, there are plenty of examples of foam-and-pocketed coil mattresses in this price range. It's less common to find a hybrid mattress with a synthetic latex layer. We have to consider the Eight Sleep Jupiter+ alongside the Mars+. The Jupiter mattress uses the same synthetic latex up top, along with a layer of memory foam, and a support core of polyurethane foam. The Jupiter+ also comes with the sleep tracker, but costs $300 less than the Mars+ mattress.
In our performance tests, we noticed subtle differences, but the Mars and Jupiter mattresses have more in common than they do differences, so check out our review of the Jupiter+ if you are considering the Mars+.

It's tricky to assign a value to the Mars+ system with the Sleep Tracker since it's such a unique combination. If you are interested in using data to analyze and hopefully improve your sleep quality, then we do think it's a good value.

Value Rating 8 /10 Very good value


Other Factors to Consider


  • Free delivery 

Eight Sleep includes free delivery, which is not particularly unusual among its competitors.



  • 100-day trial period
  • Full refund

Eight Sleep offers buyers a 100-day trial period. Returns within the trial period are free, but you'll need to provide proof of donation or disposal. Eight Sleep will help you find a place to donate the mattress.



  • Warranty Length: 10 years
  • Indentation Coverage: 1” and above

One of the biggest, if not THE biggest complaints about any mattress from consumers regards body impressions—the inability of a mattress to spring back, eventually creating a low spot/sinkhole in the mattress. As such, mattress warranties all contain a term defining how big a sag or ‘body impression’ (measured when no one is on the mattress) is considered a defect, and thus covered under the warranty. The industry standard for innerspring mattress is 1.5”. Eight Sleep has chosen to cover indentations that meet or exceed 1”. Practically speaking, that means any softening or sagging would need to be at least that deep before the warranty would offer you protection.


Bottom Line: Is the Eight Sleep Mars+ Mattress Right for You?

The Eight Sleep Mars+ mattress is a unique mattress plus sleep tracking system. Here’s who we think the mattress is best for, based on our evaluations

BEST if you:

  • Sleep in a variety of positions
  • Move around and reposition frequently
  • Enjoy a buoyant feeling of floating on top of the mattress
  • Are easily disturbed by a partner's movements
  • Want to monitor and track sleep data

NOT IDEAL if you:

  • Prefer a slow, melting into the bed feeling
  • Need the best pressure relief
  • Don't care about tracking your sleep quality

Is the Eight Sleep Mars+ bed right for you? Take our Mattress Match Quiz to find mattresses that fit your needs, based on your preferences and price range. 

Looking for more on the Eight Sleep mattress? Visit


Final Note

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