REM-Fit 400 Mattress Review UK – 2022

REM-Fit 400 Mattress








Material Quality


Value for Money



  • Comes with a 100-night trial period
  • The cover can be machine washed
  • The mattress sleep cool/does not cause overheating
  • Comes with free delivery and returns


  • The mattress does not have any handles
  • Has some off-gassing when first opened

REM Fit was founded in 2014 in the USA as a division of the mattress protector company Protect-a-Bed. They have since launched into a separate and well-known mattress company. Expanding their operations into the UK they aim to produce well-made mattresses that are reasonably priced. 

Alongside mattresses, they produce accessories such as a pillow and a sleep monitor. With their mattresses, they aim to provide ‘consistent comfort and performance through a long service life’. Offering a 15-year guarantee alongside this claim certainly shows confidence in their products.

REM Fit now has a total of four mattresses for sale. Each has a similar look, only slightly different colour schemes. The REM-Fit 400 is the cheapest of them all. Despite this, they have still used the high-quality materials used in all of their mattresses. There is a slightly different mattress structure and feel in each. For a cheaper option, the REM-Fit 400 looks like a solid medium-firm mattress choice.

We have taken a closer look at the mattress to see what it is made from and what it is like to sleep on. Taking a closer look at this mattress.

REM-Fit 400 Product information


View the latest price at Rem-Fit here.


Free next-day delivery


Hybrid (Memory foam and pocket springs)

Mattress depth:





100-night comfort trial


15-year guarantee

Existing mattress removal: 

Available as part of Rem-fit’s premium delivery services totalling £50 extra

rem fit 400 front
(Credit: REM-Fit)

Construction and Materials

The colour scheme of the REM-Fit 400 is mainly white on the top and sides. On this side, it has a curved purple stripe down going all the way around the mattress. On the other side of this, the base is all black. This gives the REM-Fit 400 mattress a very modern and stylish look. It is quite a neutral colour scheme and should fit well in most bedrooms if left uncovered.

Being a US company, all REM-Fit mattresses are designed in the USA, they are manufactured within the UK though. As a result of this, they use Certipur foam in all of their products. This is an independent testing board which approves the foam and checks it does not contain heavy metals or release damaging pollution. 

The REM-Fit 400 is an interesting mattress which including the cover has a total of five layers. We have broken down each one to see what it adds to the mattress.

1. Re-Ax Breathable Cover Layer

The cover of the REM-Fit 400 is made from a RE-Ax Fabric. This is a material with a silky feel designed to be very breathable. As a result of this, the mattress cover is great at adding to the mattresses cooling properties. 

When this mattress cover needs to be washed it can easily be zipped off. It is then machine washable. Allowing you to keep the mattress clean and hygienic.

At the bottom of the base, it features a non-slip material. This is useful as it prevents your mattress from sliding on the base, preventing potential damage to the structure of the mattress.

2. Cool Open-Cell Memory Foam  

The second layer of this mattress is memory foam. This will mould around the body when it is laid on, it creates a comforting effect. One that memory foam is best known for. As this mattress is designed for recovery, it provides pressure relief to the key joints to allow your body to fully relax.

Following on from the covers breathable design, the memory foam is designed with an open-cell feature. This promotes airflow and is designed to combat the traditional memory foam problem of overheating. It is stated that the open-cell design is up to thirty times more breathable than traditional memory foam. This keeps you sleeping at an ideal temperature.

rem-fit 400 layers
(Credit: REM-Fit)

3. 2000 Premier Pocket Springs Layer

The REM-Fit 400’s third layer features 2000 full-sized pocket springs. This adds to the bounce and support provided by the mattress. Each is encapsulated individually and so are not influenced by movement on different parts of the mattress, only above them.

These premier pocket springs work independently of each other and with your body. This allows your body to get the support where it needs with minimal motion transfer. A great bonus if you share your bed with a partner as you will not be disturbed by their movements through the night.

4. Outside Edge-To-Edge Support Layer

This mattress has extra foam on each side of the mattress that is the same height as the springs. This prevents them from getting damaged and increases the longevity of the mattress. Another benefit of these extra side walls is that it increases the edge support of the mattress. This allows you to sleep right up to the edge of the mattress without feeling as though you are going to roll off.

5. High-Density Foam Base Layer

The base layer of a mattress needs to be very firm. This provides the other layers with a solid foundation to sit upon. A firm base helps the mattress keep its structure, using high-density foam is very common as it does the job well. Also protecting the springs. 

rem fit 400 headboard
(Credit: REM-Fit)

Comfort, Support and Sleep Quality

In terms of firmness, this mattress is rated by REM-Fit as a medium-firm. We would agree with this, rating it at around a 6.5-7.5 on a 1-10 scale. The softness of the top layers does a good job of providing comfort. This is balanced out by the lower layers. The pocket spring layer, in particular, does an excellent job of supporting the body. 

It is worth waiting a few weeks before concluding this mattress. Over time there will be slightly more sinking in the mattress but this is expected with most mattresses as the materials settle.

Back sleepers will generally be suited by the widest range of mattresses. They still need a decent level of support but it is much easier to keep the spine in alignment with different mattresses. This mattress is great in this position. The memory foam layers do a great job of conforming to the body, this springs then provide a great level of support to allow for a comfortable night’s sleep. 

Side sleepers usually want a little bit of sinkage with their mattresses, this allows the hips to get into a comfortable position while maintaining good posture. The pocket springs in this mattress do an excellent job of supporting the hips while keeping the spine in alignment and being comfortable. This is especially noticeable in average-sized people. If you are smaller than average then a softer mattress may suit you better. This will allow the hips to sink into a good position. The regular REM-Fit 500 (not the ortho) may be a great choice if this is the case.

rem fit 400 touch
(Credit: REM-Fit)

Stomach sleepers need a lot of support for their hips and shoulders. This is to be able to keep a good spinal alignment. If the mattress does not then aches and pains usually develop over time. Due to this support they usually need at least a medium-firm mattress. For the average sleeper, this mattress should be able to provide that and allow for a comfortable night’s sleep. If you are heavier than a firmer mattress may be a better fit. If you are unsure then the trial period is a perfect time to test this out. The REM-Fit 500 Ortho is an especially firm mattress that may suit you well.

Three main factors reduce heat retention within this mattress. The first comes in the cover. The RE-AX cover used increases airflow into the mattress and has very interesting cool touch technology. The inclusion of a spring layer into the mattress is the next, this greatly increases the space within the mattress that air can flow in and out of. This is generally why pocket spring and hybrid mattresses sleep cooler than other types. Finally, the open cell technology that increases the memory foam breathability greatly helps. Combining them all ends up with a mattress that does a great job of preventing overheating. Keeping you sleeping at a cool temperature throughout the night. 

Motion isolation in the mattress is surprisingly good considering it has a spring layer. The layers of foam within the mattress do an excellent job of minimising any movement transfer across the mattress. The REM-Fit 400 is a great choice for couples as a result of this. 

rem fit 400 box
(Credit: REM-Fit)

Edge support within this mattress is great. While memory foam mattresses are usually lacking in edge support. The addition of the edge-to-edge support layer does make a difference. This layer also protects the springs from moving side to side, preventing structural damage. The extra edge support allows you to sleep right to the edge of the mattress without feeling as though you are going to fall off the mattress. It is noticeable and lets you make use of the full mattress surface.

Trial and Guarantee

The REM-Fit 400 mattress comes with a 100-night trial as standard. This allows you to return the mattress at any point during this time for a full refund. If you decide to return the mattress then it is free. It is a simple process and all you have to do is get in touch with REM Fit’s customer support team and they will organise the whole process.

Another bonus of this mattress is that all returns are donated to the British Heart Foundation.

All REM-Fit mattresses come with a 15-year warranty. This is better than the average offered by online mattress companies and is a great show of confidence in the product’s build quality. If nothing else it can give you extra confidence that if something happens to the mattress over time you will be fine.

rem fit 400 free pillows
(Credit: REM-Fit)


Upon ordering the REM-Fit 400 mattress delivery is very quick. There is an option of free next day delivery. If you are not available on this date then you can also choose a delivery time that suits you.

The mattress will be delivered to a room to your door so you will have to take it to the room of your choice and unbox it. After removing the mattress from its packaging it will rapidly expand and should be ready to use within a few hours.

When you first remove the mattress from its box there may be a strong smell. This is completely normal and will disappear after a few hours/days. Many mattresses that are packaged like this have a similar smell.

Customer Reviews

While a smaller company, REM-FIT are extremely well regarded on Trustpilot. They have 80% of their 1000 reviews rated as excellent, giving them an overall rating of 4.6/5. This can be viewed here.

Available Sizes



UK Small Single
190 x 75cm
Long Small Single
200 x 75cm
UK Single
190 x 90cm
EU Single
200 x 90cm
UK Small Double
190 x 120cm
UK Double
190 x 135 cm
EU Double
200 x 140cm
UK King
200 x 150 cm
EU King
200 x 160cm
UK Superking
200 x 180 cm

Our Verdict

The REM-Fit 400 mattress is a solid mattress that provides a great sleeping experience. It is especially impressive considering this is REM Fit’s base model. For a medium-firm mattress, it provides all the support you could ask for. Even for larger people. 

A particularly impressive part of this mattress is its cooling properties. If you have struggled with overheating or waking up with sweats in the past. This could be an excellent mattress for you.

rem fit 400 feature
(Credit: REM-Fit)

While awards from magazines and large websites are usually subjective. It does add to the respect and regard that the mattress has. The REM-Fit 400 is Good Housekeeping Approved and is generally well regarded in other well-known review sites.

In Terms of REM as a company, they have a very good reputation for providing a good quality product. They are approved by the National Bedding Federation which independently checks companies to see if they are making quality mattresses following all the right protocols. 

This mattress provides a great balanced product. Providing a solid memory foam mattress with good technology at a reasonable price. REM-Fit has made a great mattress that will be an amazing fit for a lot of people including couples. To conclude this review, this mattress is a great choice for anybody who is looking for the following:

  • A good value medium-firm hybrid mattress.
  • A mattress that has good support and company reputation to back it up.
  • A mattress that is going to allow you to sleep at a comfortable temperature.