Leesa vs Simba Mattress

Disclaimer: This is my personal honest opinion of the differences and similarities between the Leesa and Simba mattresses. I was sent the Leesa for £1 for the purposes of doing comparisons. There is no input by Leesa into my editorial. I paid for the Simba myself.
Please note that the links back to the Simba and Leesa websites are affiliate links. This means I get a small commission if you buy via my link. This is no way affects my objectivity. Just making this clear!

The Companies

Simba: Sold through by SimbaSleep who started up in 2015 and started selling in 2016. A London based company with the mattress being manufactured in Derby.
Leesa: Sold through Leesa Sleep who started in America in 2014 and came to the UK in 2016.
So both are UK based with Leesa having a near 18 month start on Simba. Leesa sell to the USA but Simba do not sell currently outside of Europe.

The Headlines:

Both sell a Bed in a box with a 100 night trial. Free pickup if you don’t want to keep it. 10 year limited warranty.
Simba states all their foam is CertiPUR® certified, however the Simbatex cannot be certified since it is latex. Simba have 2500 mini conical pocket springs (in a king size).
Leesa have big ethical credentials and give away one in ten mattresses sold to needy causes. Leesa use Avena foam (a patented type of polyfoam). The Avena is aerated and convoluted for better cooling.

Regional Differences

Both sell a single mattress version. However while the specs are the same the USA Leesa carries CertiPur certification that the UK mattress does not.

The Mattress

You buy and try the Simba mattress direct with John Lewis as well as AIS independent retailers and furniture Village. You can also buy via Amazon, Ocado and Argos. Leesa can also be bought via Amazon. Simba has four layers, Simbatex (latex) on top of mini conical pocket springs, then memory foam then the base layer. Leesa has three layers, the top Avena foam layer (polyurathane foam), memory foam and then the base layers. Leesa has 1cm more total comfort layers while Simba has a 1cm higher base layer.


Simba: This is 100% polyester, with a thinnish and stretchy feel. Described by Simba s highly breathable. The generic white top and grey sides in colour but with a nice textured side I have not seen in other covers. A label on the side carries the only branding, the name Simba in blue. This cover comes with the zip sealed and Simba say it voids the warranty if you remove it. Cover is not washable. One piece cover with zip on the bottom. There are no handles.

Leesa: 100% polyester. The cover is slightly thicker and with a more substantial feel than many covers on similar mattresses I have tried. It has a type of quilted lined pattern to it. A one piece design that must be removed from the bottom. Leesa do not advise machine washing the cover, spot clean only. The light blue come grey colour of the top with a white lines at one end makes it standout out from the crowd which is normally white on top and grey on the sides. No handles. Label on the side carries the name Leesa as the branding.
The Simba cover feels as though its slightly more breathable and may allow for better cooling. Neither mattress has handles or a washable cover. Leesa has the nicer colours in my opinion.

Top Layer:

The top two layers are where the first of the big differences between the Leesa and Simba mattresses show themselves.

Simba: 4 cm (1.5 inches) Simbatex (synthetic latex). Density: 60 kg/m3
Leesa: 5 cm (2 inches) Avena® polyfoam. Density: 50 kg/m3

Synthetic latex vs high density polyurethane foam: Latex sleeps cooler than polyfoam. However Avena foam has holes through the surface as part of the production process which results in more air circulation and thus better cooling. It also is convoluted with channels cut through the bottom to again improve cooling by adding air circulation. The Simbatex sits on small pocket springs which also allow for better air circulation.
Both of the top layers are on the soft side. Simbatex being synthetic latex (made with petro chemicals) has a sticky feel to it, almost memory foam like and lacks the bounce associated with natural latex. Because the Leesa Avena foam has holes and channels it is also softer than a standard high density poly foam with less bounce. In this regard they are similar but the top layer on Leesa is the softer of the two. Simbatex on the other hand has less bounce.
Simba claim CertiPUR® certification on all foam layers but this does not apply to the Simbatex.
The 60 kg/m3 for Simbatex is what you would expect for a soft top layer made from synthetic latex. natural latex would be denser/heavier.
Leesa at 50 kg/m3 is also fine for the top layer especially as Leesa say this is the density AFTER the holes and channels have been cut.
Leesa has a generous 5 cm for the top layer, this is above average for this type of online mattress.

Simba Spring Layer:

Simba: 2 cm (0.8 inches) Mini conical pocket springs

Below the Simbatex top layer sits the mini conical pocket springs. Pocket springs are springs that are all individual so pressure only affects the actual springs below and not the rest of the mattress as in an inner coil mattress. Mini springs are designed to add comfort, resilience and bounce to a mattress, they are not there for support as in full size pocket springs. Conical means they are cone shaped to allow the spring to collapse in on itself giving a greater range of collapse and also tailor the degree of resistance. How this layer effects the Simba is hard to judge since you do not actually feel the springs below you and they offer little resistance. Additionally Simba is not particularly bouncy. However they will add some life to the mattress over time.

Second Foam Layer:

Simba: 3 cm (1.1 inches) Memory foam (CertiPur certified). Density: 55 kg/m3
Leesa: 5 cm (2 inches) Memory Foam. Density: 50 kg/m3

Both mattresses have there memory foam layers under 5 cm of comfort layer above. The 50/55 kg/m3 density is what we have come to expect at this price level for an online mattress. The main difference is the 5 cm in Leesa compared to the 3 cm of memory foam in the Simba. This is another reason for the main differences between Simba and Leesa. The memory foam is more obvious in Leesa as in how it affects the feel of the mattress and how you sink slightly slower into it. Having the memory foam this far down the layers means heat retention will not be an issue.
According to the Simba website this layer and the layer below are CertiPur certified for low VOCs.

Base Layer:

Simba: 16 cm (6.3 inches) polyurethane foam. Density: 33 kg/m3
Leesa: 15 cm (6 inches) polyurethane foam. Density: 33 kg/m3

Pretty much the same specified density. Simba having a slightly larger base in terms of depth. The base layer pretty much just needs to be firm so density is less important as the compression is minimal.
You can place either mattress on pretty much any surface apart from the floor for hygiene reasons, directly on springs or a slated base where the slats are wide apart and foam can sink into the gap.

Total height:

Both mattresses are specified to be 25 cm ( 10 inches) high.
My Leesa is actually just over 24 cm (9.5 inches) high because of the way the top convoluted layer is glued to the memory foam above you lose just under 1cm, it becomes in affect depressed by near 1 cm.
The split between comfort layers and base layer is slightly different with Leesa having 10 cm of comfort layer and 15 cm of base layer. Simba has 9 cm of comfort layer and 16 cm of base layer. Personally I prefer more comfort layer.

Average Foam Density

Simba: 40.6 kg/m3
Leesa: 40 kg/m3

Higher density is normally an indication of better longevity down the line. However how the density is distributed is also important as the higher up layers will suffer the most wear and tear. Simba has the higher density for the comfort layers although there is less total foam. They do however also have the 2 cm of pocket springs which add both weight and resilience. Overall this is a draw for probable life span because while the comfort layers are of higher density on Simba, Leesa has thicker layers and overall they all weigh the same on the comfort layers. Simba has the greater overall weight because of the bigger base layer.
These figures are based on the official specifications of the mattresses.

The containing box will weigh  about 2-3 kg.

Mattress weights:

These are my own calculated weights based on me weighing my own mattress.

UK single 19.5 kg
EU single 20.5 kg
UK double 29 kg
EU double 32 kg
UK king 34 kg
EU king 36.5 kg
UK super king 41 kg
single 18.5 kg
EU single 19.5 kg
double 28 kg
EU double 30 kg
king 32.5 kg
EU king 35 kg
super king 39 kg

So Simba is the heavier mattress by 5%.

Tests and Analysis:

Edge support:

Foam mattresses are not the best for edge support and despite differences in firmness they normally score about the same. This is because the comfort layers collapse quite easily down to the base layer which is the firmest layer and the base layers are often the same size.

Score: 7.5/10 for both

Firmness (sinkage):

Again very similar in feel to an extent but Leesa is the firmer of the two. Both on the softer side compared to the others I have tried. I would say Simba is a soft mattress while Leesa is more medium to medium-soft. Leesa is softer on the top layers than Simba, so if you are below average in weight you may find Leesa softer than Simba because you will mostly feel the top layers. The memory foam layer is nearly twice as deep on Leesa which will also lend a sinking feeling to the Leesa. Simba is a teeny bit more cradling in terms of spot relief.

Simba: 6.5/10 for both
Leesa: 7.5/10 for both


Both of these mattresses are good options for people who need to sleep cool or are sensitive to the heat issues with memory foam. Leesa beats any other polyurethane foam top layer mattress because of the holes and channeling in the Avena foam allowing for lots of air circulation. Simba doesn’t have the holes you find in a natural latex foam but does have reasonable air circulation as synthetic latex sits above the pocket springs. Latex would be preferred to poly foam for cooling.

Simba: 8.5/10 for cooling
Leesa: 8/10 for cooling

Spot Relief:

Just to be clear, almost all foam mattresses offer good spot relief compared to alternatives. I am giving a measure of relative spot relief properties between mattresses I have tested. Firmer mattresses have an advantage here as they will suppress the amount of foam under pressure. Both Simba and Leesa are softer mattresses which means they are likely to be not so good for spot relief compared to others. This doesn’t mean they wont give at pressure points but means a slightly larger area outside of this will also flatten compared to others. Between the two of them Simba performs slightly better than Leesa.

Simba: 7.5/10 for spot relief
Leesa: 7/10 for spot relief

Mattress for Sex/Bounce:

The top poly foam layer of Leesa has more bounce than the dead feeling of the Simbatex on top of Simba. This means very light people will find Leesa a little more bouncy than Simba. However for everyone else when all layers are taken into account they will have about the same bounce. Leesa having a fraction more but not in a significant way. For me this is tie in terms of best mattress for sex.

Simba: 7/10 for bounce
Leesa: 7/10 for bounce

Weight Capacity:

Both mattress companies state a maximum weight of 114 kg (18 stone) per person.

Motion Transfer:

Another area where all foam mattresses generally score well. Motion transfer meaning how little movement you feel when your partner moves on the bed. Simba is actually one of the best mattresses I have tried in this regard although Leesa does well too. But its a win for Simba.

Simba: 8.5/10 for cooling
Leesa: 7.5/10 for cooling

Type of Sleepers this mattress suits:

Both mattresses are on the softer side but Simba is softer than Leesa. This makes them both shoulder friendly for side sleepers where they score best. The extra softness of Simba will not make this a great mattress for stomach sleepers for all but the lightest of individuals. Leesa is the better option in this regard. Back sleepers have more room for manouveure in terms of the fight firmness and I would score them both the same in this area. It will come down to your own preference and body shpae.

Simba: Back sleepers 8/10 Side sleepers 9/10 Stomach sleepers 6/10
Leesa: Back sleepers 8/10 Side sleepers 8/10 Stomach sleepers 8/10


On average Simba is more expensive than equivalent Leesa sizes but the price range isn’t so great as to be a total deal breaker and of course offers come and go chnaging the price differential.


Simba: Features a CertiPUR certified mattress meaning a guarantee of low off gassing and no harmful chemicals in the foam. However this does not cover the top Simbatex layer, the one you are most exposed too and the conical pocket springs below it. Simbatex is a proprietary form of synthetic latex. The 2 cm conical pocket springs are a patented design. The base layer has zoning to increase give at shoulder and hips level. The foams used are of a decent specification, what you would expect at this price level.
Leesa: Avena foam offers high resiliency and holes to aid cooling. 10 cm of comfort layer including 5 cm of memory foam giving Leesa a unique feel in the online mattress market. The foams again in terms of density are exactly what you expect at this price level.

Simba: 8/10 for materials/design
Leesa: 7.5/10 for materials/design


Simba had the strongest smell on day one. Synthetic latex does have a strong odor. Leesa had a smell but was nothing too bad and what I expect from a newly unwrapped foam mattress. In the long run the smell on Leesa lasted just a little longer before subsiding than Simba.


This is purely subjective and my idea of comfort probably has no meaning for anyone else, we all have different sensitivities when it comes to the feel from our bed. I must add that comfort also does not always translate into the best bed for you. This is true in my case where my lower back requires more support than what my body will call comfortable. In terms of sheer comfort Leesa is my most comfortable choice so far. However its less than great spot relief means my lower back does not like long periods on the bed. This is a shame for me personally. Simba also lacks the support I need but is better than Leesa. However for a quick nap and in terms of sheer comfort Leesa is my pick of all the mattresses I have tried.


Simba has 7 zones. That is to say 7 areas where the amount of foam cut from the base layer differs to tailor give and firmness.


Itemout of 10
Edge Support 7.5 for both
FirmnessSimba: 6.5, Leesa 7.5
CoolingSimba: 8.5, Leesa: 8
Spot ReliefSimba 7.5 Leesa: 7
Sex/BounceBoth 7/10
Motion TransferSimba 8.5, Leesa 7.5
Back SleepersBoth 8
Side SleepersSimba: 9, Leesa 8
Stomach SleepersSimba 6: Leesa 8
Price Leesa cheaper
Materials/Design Simba 8, Leesa 7.5
Smell/off-gassing Simba slightly better
Zoning:Simba 7 zones

Simba vs Leesa, the conclusion

Simba sits on the softer side of the fence while Leesa is middle ground for firmness. Its latex vs polyurethane foam for the top layer. But the latex is fully synthetic and the polyurethane foam is Avena foam. The Avena foam is noticeably softer and bouncier than the Simbatex. The heavier you are the less you will notice this difference. Leesa is more cradling though overall they are both softer mattresses with similar overall bounce. Simba just edges it for sleeping cool but they are both above average choices. Leesa has 5 cm of memory foam as oppose to the 3 cm of memory foam on Simba and the difference it makes to the overall feel is clear. You will sink in more with Leesa with the slower response times, something I quite like but without the hear issues of a top memory foam layer. Both have similar densities for their foam layers so nothing to choose between them on that side of the equation. On first laying down you may well find Simba a tad firmer than Leesa but the amount of actual give is the same. Simba having pocket springs and Leesa having a big memory foam layer means Simba has more push-back giving a sense of extra firmness without actual sinking less than you would on Leesa.

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