Simba vs Otty Mattress Review

Disclaimer: This is my personal honest opinion of the differences and similarities between the Simba and Otty mattresses. I paid for both of these mattresses myself and have not been sponsored or endorsed in any way to give a positive review as does happen. Please note that the links back to the Simba and Otty 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 by SimbaSleep who started selling online in 2015. A London based company.
Otty: Certipur certified. Sold by Otty sleep Ltd who started selling in 2016. Leeds based.

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. 2 man delivery team to room of your choice.
Simba Certipur certified for the polyfoam layers, Hybrid mattress using 2500 micro conical springs and Simbatex (synthetic latex).
Otty Gel Memory Foam top layer, 2000 full size encapsulated pocket springs, Otty Regulating Airflow System, Otty comes with a dust cover for the mattress.

Mattress Details

Essentially two very different mattresses despite both using springs. Simba has a synthetic latex top layer called Simbatex while Otty uses a memory foam top layer infused with gel beads. Simba uses micro pocket springs for comfort while Otty uses full size pocket springs for support. Pocket springs move individually and are only connected by the material used to wrap them.

Try Before You Buy:
Simba Try Simba at John Lewis in-store as well as AIS independent retailers and furniture Village.
Otty You can try Otty at selected selected Next Home stores.


Both mattresses go for the all too popular bland white top and grey sides.
Simba: This is 100% polyester in line with almost every other online companies I have tried. The top section of the cover can be unzipped and machine washed at 40 degrees. The grey base fabric can be cleaned with a soft, damp and clean cloth using small circular motions. The cover is an all in one piece that unzips from below making removal awkward. The sides of the cover have a textured affect which is aesthetically pleasing and quite unusual.
Otty: 97% polyester and 3% spandex on the top cover. Spandex (aka Elastane, Lycra) gives the cover a stretchy feel. The rest of the cover (sides and bottom) are 83% polyester and 17% cotton. Great news is that the cover is machine washable although it unzips from the bottom which makes removal awkward. The bottom portion removes fully from the top and side sections. The cover is 500 gsm in weight which is a good quality weight. The top portion while stretchy is also quite thick feeling.

Top Layer:

The top layers are very different on the two mattresses. Here we have memory foam vs synthetic latex. Generally latex will sleep cooler but Otty have done a lot to try and reduce the differences but it must be said, latex will always win out for cool sleeping. Memory foam will win out for spot relief however because of the size of the layers you must take the whole mattress feel into consideration for this.
Simba: 4 cm (1.6 inches) Synthetic Latex (Simbatex). Density: 60 kg/m3 (3.7 pcf)
100% synthetic latex with some added soybean oil and a natural balm to aid cooling. 60 kg/m3 for the density is what you would expect for the top layer as synthetic is less dense than natural latex. This is quite soft to the touch and a little less responsive than natural latex and even some high density polyfoams. However the difference is small and it is still more responsive than memory foam. Simba have named this foam as Simbatex but while there will be some proprietary elements it is ultimately a synthetic latex which is a petro chemcial product just as polyfoams and memory foams are. It is duller and less springy than natural latex. Synthetic latex can also be used by people normally allergic to natural latex. Simbatex is a good choice for those looking to sleep cool, especially when compared to memory foam.

Otty: 3cm 1.1 inches CertiPur Gel Memory Foam. Density: 50 kg/m3 assumed
As with all the Otty foams, this is CertiPur certified. Gel is embedded to aid cooling as memory foam tends to sleep hot. While there are differences of opinion on whether this is effective or not, it certainly has the potential to sleep cooler than memory foam that do not use gel. Otty have also created holes along the surface that along with the holes in the side aid in air circulation and thus also will potentially allow the Otty mattress to sleep cooler than other memory foam top layer mattresses. It should be noted that the use of gel beads can also help with responsiveness, thermal conducting (spread of heat away from the body) and overall density. The memory foam is very much a true memory foam with its slow response but high contouring properties. Many memory foams today are more of a mix of memory foam and high density polyfoam which helps responsiveness but loses out on the contouring properties. 50 kg/m3 is not a high density for the top layer but it is soft as a flip side.

Second Layer:

The second layer are the micro springs on the Simba while its polyfoam on the Otty.
Simba: 2500 micro conical pocket springs (in a King size), 2cm deep (0.8 inches)
The much talked about micro pocket springs. These are first and foremost used to aid the comfort layers, they do not provide support in the sense that they are not designed to hold your body up but to aid contouring. Conical means the top falls into the layers below allowing the spring to fall as flat as the width of the wire. They add some durability and a subtle amount of bounce to the layer above. It changes the feel that you would have had from an all foam mattress. The pocket springs are boxed in (encapsulated) so that firmer foam can be sued along the edges of the mattress to aid edge support.

Otty: 3cm (1.1 inches) soft standard foam.
This is high density polyfoam with a softer feel to give some cushioing between the memory foam and full sized pocket springs.

Third Layer:

This is Ottys main support layer while for Simba this is the contouring memory foam layer. While this layer is still part of Simbas comfort layers for a total of 9 cm on Otty this is the main support layer with 6 cm of comfort layer above. This is one of the reasons Otty has a firmer feel than Simba.
Simba: 3 cm (1.1 inches) Memory Foam. Density: 55 kg/m3 (3.4 pcf).
Certipur certified memory foam according to the Simba website. 55 kg/m3 is a reasonable density given that it is lower in the mattress and density is a little less important further down. Placing memory foam here will deaden the feel of the mattress compared to a high density polyfoam and add some contouring that holds its shape a little longer than other foam types. This means the comfort layers extend for 9 cm.

Otty: 14 cm (5.5 inches) encapsulated pocket springs. Gauge: 1.6mm
This is the main support layer for Otty, those full sized pocket springs. This is the firmer range of guages found for pocket springs. Overall these pocket springs give the mattress a lot of bounce and a lot of deep spot relief. This is the layer that makes most difference between the Simba mattress and the Otty mattress. The difference between using foam here or full size pocket springs totally changes the feel of the mattress. The 6 cm of comfort layers above are not quite enough to avoid the obvious feel of the springs below. Not in the sense that springs push into you but in the sense that springs give a sense of push back which is why the bounce is good on the mattress. Pocket springs can offer more durability than foam.

Base Layer:

For Simba this is the main support layer and the one to hold your body up while on Otty it is more of a base for the pocket springs which are the main support layer. Using pocket springs as oppose to firm high density polyfoam for the support means better spot relief, bounce and contouring for the pocket spring mattress in general. Other factors such as the layers above come into play of course but between the Simba and the Otty the different base layers produce the differences you would expect. As said the other effect of the pocket springs is a higher degree of push back.

Simba 16 cm (6.3 inches) polyurethane foam. Density: 33 kg/m3 (3 pcf) This layer is zone (castellated) to fine tune the give in different areas. Extra channels have been cut to increase the give at the shoulder and hip level in comparison to the rest of the mattress.
Otty 5 cm (2 inches) high density Polyfoam. This layer has holes running through it as does all layers in order to increase air circulation and cooling.

Total height:

Both mattresses are 25 cm (9.8 inches) high.

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
UK single 20 kg
EU single 21 kg
UK double 30 kg
EU double 33 kg
UK king 35 kg
EU king 37 kg
UK super king 42 kg

Otty is slightly heavier but this includes the weighty cover.

Tests and Analysis:

Edge support:

Both mattresses are around average for edge support. However there is a major difference and that is for lighter people the Simba will be noticeably worse while for heavier people there will be little difference. This is due to the big difference in soft comfort layers used. Simba starts off with 9 cm of soft comfort layers while Simba uses 6 cm before you hot the firmer support layers. Those comfort layers will give very quickly on the edge as you sit down. This means lighter individuals will notice more compression from the top layers than heavier individuals.
Simba: 7.5/10
Otty: 8.5/10

Firmness (sinkage):

Here we have one of the major differences. Simba is a noticeably softer mattress which will suit side sleepers more than it will suit stomach sleepers depending on your weight of course. For me personally I just lack enough lumbar support while on my back with Simba but prefer it for side sleeping. Of course please remember how a mattress feels to you, soft or firm, is totally dependent on your body size and weight and your personal perceptions of firmness. However relatively between them Simba is softer.
Simba: 6.5/10
Otty: 8/10


Many factors go into how hot or cool you will sleep in a mattress. Not least the bedding and room itself having an effect. However in terms of the mattress top layers which have the most bearing then Simba will sleep cooler all other things being equal. Latex sleeps cooler than memory foam because memory foam needs to absorb heat for its molding properties. However you should note than the synthetic latex used for the Simbatex is not quite as cool sleeping as natural latex. Similarly the memory foam used on otty is embedded with gel in order to help reduce the heat build up and has holes throughout then layer to again aid air flow and cooling.
Simba: 8.5/10
Otty: 6.5/10

Spot Relief (point elasticity):

This is a big win for Otty. Simba being softer overall will always be at a disadvantage for sheer spot relief. The full size pocket springs used on Otty do a good job of providing targeted support as they move individually. They are also on the firmer side for pocket springs increasing its supportive properties.
Simba: 7.5/10
Otty: 9/10

Mattress for Sex/Bounce:

Probably the biggest difference between the two mattresses is the amount of bounce. Very little on Simba and a lot of deep bounce on the Otty despite the memory foam top layer. Whether you agree with my marking best mattress for sex as one with good bounce will be a mater of opinion. However I do mark this based on bounce alongside comfort.
Simba: 7/10
Otty: 8.5/10

Weight Capacity:

Otty has a higher than average weight capacity. Don’t forget these are per person so x2 for a double.
Simba 18 stone (114 kg).
Otty 139 kg 21.8 stone.

Motion Transfer:

Simba is one of the best mattresses I have tried for motion transfer with little motion carried across the surface as you put pressure on a particular area. Otty is a little better than you would expect for such a bouncy mattress because of the soft memory foam top layer.
Simba: 8.5/10
Otty: 7.5/10

Type of Sleepers this mattress suits:

This is totally dependent of your size and weight. Lighter people will have no issues stomach sleeping on Simba for example while average and heavier individuals may well do. This is based on the average person. Stomach sleepers should feel the mattress is firm, side sleepers should have a softer feel and back sleepers have a wider amount of feel they can get away with.
Simba: Back: 8/10 Side: 9/10 Stomach: 6/10
Otty: Back: 8/10 Side: 6/10 Stomach: 8.5/10


Otty is consistently cheaper than Simba so has an advantage here.


Pretty much a draw for me. Both carry CertiPur certification although this means the latex on Simba is not certified. Both have made use of a hybrid design but in different ways. Both have omitted handles and both allow for machine washing the cover but it unzips from underneath. Simba has zoning on the base layer while Otty has holes all around to allow for air flow. Otty also uses gel to help improve the heat properties of memory foam. Simba uses latex rather than polyfoam for the top layer although it is fully synthetic. Both have genuine unique selling points.


Both had an initial smell. This was stronger on Simba than Otty but Otty took longer to fully dissipate so I make Simba the winner here. However both mattresses were smell free within a couple of weeks. Always fully air a foam mattress for 48 hours before sleeping on it.


There are two ways of looking at this. You can score comfort on how it feels for the first half of the night or for the second half of the night. if you are not getting the support you need and your spine is not aligned you may well find yourself waking up aches in the morning despite having a good first half to the night. This of course is totally subjective and differs by individual. Simba being a softer mattress for me feels better in he first half of the night but my lumbar region suffers from lack of support over the long term. For me Otty wins over the long haul though without a topper I could not personally say it is comfortable. Otty has the support I need so I wake up happier than I do with Simba. Please bear in mind the many variables that go into this and I am just trying to give my personal experience. You may well have a totally different opinion. I would guess that lighter individuals will tend to have a preference for Simba while heavier individuals will have a preference for Otty.


Simba has seven areas of zoning in the base layer. This is made up of 4 areas with channels cut through and 3 areas with no channels. The affect is to give more give at the shoulder and hips.


Item out of 10
Edge Support  Simba: 7.5 Otty: 8.5
Firmness Simba: 6.5 Otty: 8
Cooling Simba: 8.5 Otty: 6.5
Spot Relief Simba: 7.5 Otty: 9
Sex/Bounce Simba: 7 Otty: 8.5
Motion Transfer Simba: 8.5 Otty: 7.5
Back Sleepers Simba: 8 Otty: 8
Side Sleepers Simba: 9 Otty: 6
Stomach Sleepers Simba: 6 Otty: 8.5
Price Otty is cheaper
Materials/Design Draw
Smell/off-gassing Draw
Zoning:  Simba has 7 zones

Simba vs Otty, the conclusion

The headlines may sound similar, hybrid mattress with pocket springs, but the reality is quite different. There are several big differences, soft vs firm, bouncy vs not bouncy, cooler vs hotter, cheaper vs more expensive etc. So Simba has more comfort layers including the micro conical pocket springs and is the softer mattress while Otty has more support via full size pocket springs. Both have CertiPur certification but Simba lacks certification for the latex top layer as Certipur does not cover latex. There is no better or worse mattress here, rather it is a case of which is going to suit you more. The differences are quite big so you need to know where your preferences will be. Read more in depth details about the Simba Mattress here Read more in depth details about the Otty mattress here
Otty and Simba layers