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Mattress Review Mars by Eight Sleep

The Mars hybrid mattress by Eight Sleep is their pressure relieving mattress with optimal air flow too. It features four layers including two comfort layers over a 4″ thick coil system and another layer of dense base foam. This makes for an 11″ mattress including their smart cover. The Eight Sleep Mars mattress has one feel that will be a medium firmness to most sleepers. This will work well for dominant back sleepers and occasional side and stomach sleepers too.

Eight Sleep Mars Mattress Benefits:

This mattress is the only hybrid option Eight offers in their mattress line up. Hybrids generally offer benefits that all foam options tend to lack. One being sleeping cooler due to more air flow and a place for heat to dissipate. This offers heat retained in the foams an outlet away from your body. It also offers a bit more response and ease to move on than an all foam counterpart. Having a coil system creates a bit of spring that moves with you. It also provides more durable support and a consistent feeling sleeping surface.

The Mars mattress comes in at an affordable price and can be purchased either the mattress alone or with a tracker, making it a Mars Smart mattress. It also has a 10 year warranty and 100 night sleep trial. As well as free shipping and returns if it doesn’t work out for any reason.

Eight Sleep Tracker:

This mattress, as well as all Eight Sleep mattresses, are compatible with their sleep tracker. This tracker is the technology that makes their brand stand out. Their tracker is a mattress cover that fits over the mattress and offers several benefits. Ranging from sleep tracking, smart alarm and dual temperature warming features. The app is also able to sync with other devices to promote healthy sleeping and an ideal feel.

Find out more about the Eight Sleep Tracker and Smart Mattress features HERE!

Eight Sleep AI-Powered Personalized Sleep Coach
Below we have our comprehensive and detailed review for the Eight Sleep Mars mattress. We will go through how it performs for off gassing, comfort, motion transfer, sleeping cool, edge support, value, material, trial and warranty.

Also, remember that if you have questions or need more insight during your mattress buying journey, please feel free to contact us. We are here to help and make sure you find the best mattress for you!

Check out this article for more hybrid mattress reviews

Eight Sleep Mars Rating
  • Delivery & Off Gassing
  • Comfort
  • Motion Transfer
  • Sleeping Cool
  • Edge Support
  • Value
  • Materials & Construction
  • Trial Period
  • Warranty

Overall Rating:

The Eight Sleep Mars is the only hybrid available in this line up. This bed is going to work best for anyone who likes a softer feeling mattress and more than likely a side sleeper. It also works perfectly with their sleep tracker to provide a technology driven sleeping surface.

Buy Your Mars by Eight Sleep Mattress Here SAVE NOW - CLICK HERE!


Off Gassing

The very first thing to do with your new Eight mattress is take it out of the box and get it set up. It should show up right at your door and in a fairly compact box, for a mattress anyway. Getting it to where it needs to go may take two sets of hands. It is about 75 lbs and a little awkward to maneuver if you’re on your own. Once you get it to where you’ll be sleeping it should only take a few minutes to get it out of the box and take it out of the plastic and come to life.

The unique thing about the Eight is that there is a separate box with just the smart cover. This will need to be put over the mattress once it is fully formed. To operate the cover all you need to do is download the Eight App and you will have full access to all your sleeping metrics.

During the unboxing process you will notice a bit of off gassing but it should be very minimal. With most boxed mattresses there will be a little bit of smell once it is allowed to unroll and take shape, but this one is made in the US which helps tremendously with cutting down on any noxious odors. It should be fine within a few hours but if you are more sensitive to certain smells letting it breath up to 12 hours would probably be a good idea.

When setting up your new mattress it will need a foundation that provides a flat, even surface that will support the weight of the mattress as well as the sleepers. It also will need to be the right height for you as well as be aesthetically appealing. The Eight mattress would work great on a box spring with or without a frame, an adjustable base, a platform bed or slatted bed. To find a foundation that would work for you check out our frames & bases reviews.

mattress foundation chart



The Eight Mars mattress uses a four layers of foam and coils to create an ideal feel. The top layer is a reactive foam that is suppose to have the bounce and response of latex. This is a comfort layer that also is meant to aide in keeping the mattress from getting too warm. Under the top layer is a layer of comfort transition foam to create a more conforming layer to help contour to your body and allow for pressure relief.

This 11″ mattress should fall around a 5 to 6 on a firmness scale of 1 being the softest and 10 being the firmest. It will work well for back sleepers, allowing enough support and enough sink to alleviate pressure and make a sleep surface that cradles your lumbar and shoulders.

The Mars mattress would work well for most side sleepers too, allowing for your shoulder and hip and to sink into a nice combination of conforming and springy foam. This mattress should even be good for stomach sleepers, and provide the necessary support throughout the night. The Eight hybrid mattress should be comfortable for the majority of people out there.

*If you are sleeping on the mattress with the sleep tracker the feel of this mattress or any other will be slightly altered. This removable cover does add its own feel to the mattress and may not appeal to all people. Unless tracking your sleep is very important to you the added “smart” layer may not be for you.


Motion Transfer

Between all the comfort foams as well as the individually wrapped coils and dense base foam this mattress will absorb most vibrations and make for very minimal to no motion transfer to be felt. The Eight mattress is great for anyone who shares a bed because of this, there will be little disturbance when getting in and out of bed.


Sleeps Cool

The Eight mattresses may be less focused on staying cool than many other mattresses which may mean it may sleep warmer. This mattress doesn’t have any added gels or cooling properties added to the top layers to prevent over heating. It also has an option to warm the bed through its smart cover but not an option to cool it.

The top layer is meant to feel more like a latex and by having a more responsive layer on top this may help with some heat dissipation. This mattress is a hybrid mattress so the coil system will also allow for heat dissipation which will help keep it cooler too.


Edge Support

The edge support on the Eight mattress should feel fairly stable and create an edge to edge usable sleep surface. The transition and base foam provide the necessary support to give the entire mattress a solid foundation, including the edges as well.

You also have an added layer of foam around the coil system to ensure a fully usable surface. Sleeping on this mattress you should feel a consistent feel across the entire top of the bed. As far as sitting on the edge goes, there is a little less support, sitting on it may be less ideal and not feel very solid.



The price for the Eight Mars Smart mattress system is $1399 for a queen size. If you were to purchase just the mattress alone it is $1199 and the sleep tracking cover by itself is $299. It also includes free shipping, a 100 night sleep trial and 10 year warranty.

The value of this mattress is good, especially if you want a smart mattress. That is probably the most special and unique part about this bed and Eight Sleep. For an even better deal just click HERE to save money and find the latest promotion on any mattress or smart mattress site wide at Eight Sleep.

Eight Sleep AI-Powered Personalized Sleep Coach

Our Sleep Guide has the latest pricing as well as any and all available coupons or discounts for the mattresses we review. We have a direct relationship with Eight Sleep and make sure that we pass along the most up to date savings and discounts to our readers.



The Eight Mars mattress is made up of four layers that make up a 11″ mattress of comfortable materials. The top 2” is made of 3lb density Responsive Foam. This foam is intended to have the benefits of a latex foam with more responsiveness and bounce. It also is meant to great for comfort and cooling and should contour well to the sleepers body.

The 2nd foam layer is 2″ of 1.8lb density Transition Foam that provides support as well as help create a tranasition between the top foams and the base foam.

The coil system is made up of 4″ of sleeved coils surrounded by poly foam . This layer provides the core of the support as well as heat dissipation and bounce and springiness.

The foundation is made of 3″ of 1.8lb density support base foam. This provides the support of the mattress and creates durability as well as stability for the foams on top.

The cover of this mattress is a simple, light weight breathable polyester fabric. This cover is meant to be covered with the sleep tracking mattress cover so simplicity of this cover seems intentional to create a better surface for the tracker to work.

For more information on the Smart Cover just go to our Eight Sleep Tracker & Smart Mattress Features page.



Trial Period

The Eight mattress has a 100 night sleep trial period. This is the online mattress industry average and what is typical offered. This trial period allows for a sufficient amount of time to see if this mattress is a good fit for you and also has a very easy return process if it isn’t.




This mattress has a 10 year warranty. Like most mattress warranties the 10 year Eight warranty is prorated to coincide with the natural average wear of the bed over time. This warranty is fairly standard and provides consumers with the confidence that this is a product that the company will stand behind.

If you are looking for more specifics for the Eight Sleep trial period and warranty find out more at or for a helpful tool check out Our Mattress Warranty & Trial Period Guide.

Manufacturer Promises

  • Shipping: Free Shipping
  • Trial Period: 100 Night Trial Period
  • Warranty: 10 Year Warranty

Current Pricing

  • Twin: $N/A
  • Twin XL: $N/A
  • Full: $$1299
  • Queen: $$1399
  • King: $$1599
  • Cal King: $$1599


The Mars by Eight Sleep Mattress might be good for you if…

  • You like a medium-firm hybrid mattress with the latex like foam on top
  • You are a tech savvy person who wants to be able to track your sleep, sync other devices to your mattress and adjust the warmth of the surface
  • You like a company that is innovative and technology driven

Buy Your Mars by Eight Sleep Mattress Here SAVE NOW - CLICK HERE!

Still looking for some more information? Visit Eight Sleep at Also, have questions for us? Please contact us and we would be happy to help you!