Polysleep Zephyr vs Simba 2500 Comparison

The Polysleep Zephyr mattress is delivered free of charge to your door (except in the Yukon, Northwest Territories and Nunavut), rolled up in a recyclable cardboard box.

As for weight and dimensions, the box weighs between 55 lbs and 90 lbs, and measures 18" x 18" x 41". The mattress weighs between 54 lbs (Twin), and 89 lbs (King Californian). It is therefore recommended to handle it in pairs! 

Unboxing it is very simple! The box has been designed to make your job easier: you simply have to pull on the tab in the middle to open the box in two pieces. Then tip it to the floor and easily remove the mattress. 

Then unroll your mattress close to your box spring or directly on it. Remove the plastic, let it return to its shape, and that's it! You can sleep on it as soon as these steps are completed.

Please note that we do not include plastic tools in the box in order to reduce our ecological footprint.

For its part, the Simba 2500 mattress can be ordered online on the manufacturer's website, or from a specialized distributor such as "Dormez-Vous? ». 

Concerning the delivery, you can choose a traditional delivery service or opt for the White Glove delivery service offered by Dormez-Vous. Free of charge in most of Canada, the White Glove deliverymen will drop off your mattress in your room. If you opt for regular delivery, please note that the box size will be 42.126" x 19.685" x 19.685". 

However, the exact dimensions of the bed are not indicated other than by their name on the model page (ex. "large size"). It won’t be easy choosing sheets at the same time!

Furthermore, neither the weight of the mattress nor the total weight including the box are indicated on the manufacturer's website. It will therefore be difficult to predict if you can install your Simba mattress alone! You might have to roll up your sleeves if you have to unpack it and install it by yourself! 
 

Indeed, it's not as easy as with the Zephyr. 

You will have to: 

1. Lay the box down to open it. 
2. Take out the mattress, which is folded in four. 
3. Flip the mattress over so the sleeping surface faces up. 
4. Place it on your bed frame. 
5. Wait from 3 to 6 hours before you can sleep on it (up to 24-hour wait to get the final shape)

11.5 inches thick, the Zephyr hybrid mattress is composed of 6 types of antimicrobial foams, divided into a total of 5 layers: 

More precisely, the Zephyr is composed of: 

• A Nanobionic® cover that captures your body's thermal energy and transforms it to ensure a better recovery during the night. Its composition: Polyester (88%), Spandex (1%), and organic cotton (11%).
• A 1st layer of hybrid foam (density: 2.6 lb/ft3) with GelFlex Plus. This provides a thermo-regulating sleeping surface so that you can always sleep at the right temperature.
• A 2nd layer of viscoelastic hybrid foam (density: 3.0 lb/ft3) ventilated and antimicrobial (ISO 20743 certified). It relieves pressure points and provides optimal air flow.
• A 3rd layer of polyurethane foam support (density: 1.8 lb/ft3), with a polyurethane foam insert of different density (2.0 lb/ft3) in its center for better support at the hips.
• A 4th support layer (polyurethane foam of 1.8 lb/ft3 density) that balances the mattress for long-term support. - a contour layer made of resistant polyurethane foam (Density: 2.0 lb/ft3) which acts as an ultra-firm support frame that reinforces the mattress and prevents it from sagging prematurely.

In addition, our foams are CertiPUR-US certified. This means that they are manufactured without chemicals that are harmful to the ozone layer. Indoor air quality is guaranteed with less than 0.5 parts per million (ppm), while being Low VOC. 

Finally, all Zephyr mattresses are manufactured according to the highest standards in Montreal, Quebec. So when you buy at Polysleep, you are supporting the local economy!

The Simba 2500 is a hybrid mattress that contains both foam and springs. With a thickness of 12 inches, it is composed of 4 layers protected with an anti-microbial cover.

More precisely, this Simba mattress is composed of:

• An antimicrobial sleeping surface (the cover).
• A 1st layer made of Simbatex memory foam, just below the cover. This layer contains viscose and graphite slats for maximum freshness.
• A 2nd layer made of miQro springs (up to 2500), which are supposed to offer maximum comfort and ventilation.
• A 3rd transition-layer made of high-density foam.
• Finally, a 4th layer of seven-zone support that eliminates pressure. The air channels within the mattress offer maximum ventilation.

What’s more, Simba states that the foams used for the Simba 2500 are also CertiPUR-US certified, just like Polysleep foams. 
They therefore have similar impacts on the environment. Finally, although each Simba 2500 is made in Canada, Simba is a British company.

This test is designed to evaluate the reactivity of the Zephyr foam in real time.

We notice very significantly an almost instantaneous rebound of the Zephyr mattress foam when pressure is applied. The foam returns to its original shape very quickly, so you don't sink in and your body is properly supported. 

The reactivity of the Zephyr foam is therefore extremely high.

We performed the same test with the first layers of the Simba mattress. You can see that the foam has not completely recovered its initial shape by the end of the video.

This shows that the Simba mattress has a lower rebound, and therefore a lower reactivity than the Zephyr mattress.

The Zephyr mattress has an integrated support contour. All the edges of the mattress are reinforced with an extremely resistant high density polyurethane foam. 

This Polysleep-exclusive design provides firm support to those who sleep close to the edge of their mattress. It also makes getting out of bed easier. 

Furthermore, it acts as an additional structural reinforcement that maximizes mattress durability and minimizes sagging when you get in or out of bed. 

And all this is easily visible in the video: sagging is very minimal when the sleeper sits on the edge of the Zephyr mattress!

Edge support is generated by its base, but also by the layer just above. The latter is made of high-density foam with reinforcements along the edges. 

However, in the video, the deformation and sagging are very noticeable when the sleeper sits down on the edge. 

This is due to the fact that this reinforced layer at the ends is placed horizontally, like all the other internal layers. This severely weakens the reinforced structure of the mattress. 

As a result, the entire contour of the mattress is not properly reinforced, which can lead to premature sagging over time.

The tests to which the Zephyr mattress is subjected clearly show that it is very resistant to transferring movement.

In fact, our Panda-Tester had to exert a lot of energy until the bottles standing on the mattress fell off.

With the Zephyr, you will be isolated from the movements of your partner or pet during the night!

Subjected to the same tests, the Simba 2500 mattress is much less resistant to movement transfer.

Indeed, from the beginning of the test, our Panda-Tester has a hard time making the bottles stand upright on the bed. Once they are standing, it only takes some light taps to make the bottles fall over!

This clearly demonstrates that its ability to isolate movement is far weaker than that of the Zephyr.

For this test, a 50 lbs kettlebell is dropped on the edge of the Zephyr mattress. 

After dropping the kettlebell three times, it remained on the mattress twice, and fell only once. 

We can therefore conclude that the Zephyr mattress has a great capacity to absorb the pressure exerted by the weight, despite the significant impact. 

The same test was carried out on the Simba 2500 mattress.

Although the weight stayed on the Simba 2500 twice, and fell off once like it did on the Zephyr, the way it happened was very different.

Indeed, the rebound after impact is much greater and the weight does not rest flat. Moreover, it sinks deeper into the mattress than on the Polysleep mattress.

The balance provided by the sleeping surface and the support provided on the edges are therefore lower for the Simba than for the Zephyr.