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REM-Fit® 400 Hybrid Mattress

Medium / Firm

The award-winning REM-Fit 400 memory foam hybrid mattress that won't heat you up. Sumptuous open-cell memory foam technology combined with 2000 premium pocket springs.

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From £439.20 Regular Price £549.00
As low as
/ month
100 Night Free Trial
15 Year Guarantee
Free Next Day Delivery
Absolutely perfect sleep - Good Housekeeping
Good Housekeeping Institute
"The five layers combine to provide a comfortable mattress which contours the body, offering brilliant support."
Absolutely perfect sleep - Good Housekeeping
Real Homes
"Supportive, comfortable and competitively priced, we highly rate this hybrid mattress which has two (more) very happy customers"

Sleep on it, jump on it and everything in between - it's yours for 100 nights to fall in love with. If it's not right for you, we'll collect for free and refund you in full.

Free next working day delivery when you order before 1pm & free day of choice delivery. Old mattress disposal can be selected at the checkout.

Buy now, pay whilst you sleep. Finance your REM-Fit with DivideBuy. 0% APR financing as low as £31/month. Apply at the basket or checkout page.

We're so confident in the build quality that we have included a 15-year full replacement guarantee at no extra cost - so you can sleep soundly for years to come!

Why Choose The 400?

Tall Pocket Springs

2000 Premium Pocket Springs

Through rigorous testing, our sleep researchers found that springs below 8cm in height provided inadequate support and failed to isolate partner movement. For undisturbed sleep & superior support the REM-Fit 400 mattress uses 2000 premium pocket springs, 15cm tall.

Weightless Pressure Relief

Weightless Pressure Relief

Memory foam gently absorbs the weight of your body, providing a soft sleeping surface on top of the supportive spring system. Coupled with our hypoallergenic stretched outer fabric the end result is often described as a feeling of weightlessness.

Cool-Gel Infused Foam

Open Cell Memory Foam

Our unique open cell memory foam provides advanced temperature regulation and won't heat up like standard memory foam. Overheating during sleep is one of the key reasons for unexplained waking during the night, disturbing our sleep cycles and affecting our overall rest & recovery.

Tired of Sleeping Hot?

Tired of Sleeping Hot?

REM-Fit memory foam benefits from a revolutionary open cell construction so that you won’t heat up! Proven to wick moisture and dissipate heat away from the body keeping your sleep environment at just the right temperature.

Why our mattresses are rated so highly

REM-Fit Mattress 400 Layers
REM-Fit Mattress 400 Layers
Comfort is in the detail
Construction and materials
  • Award-Winning Multi-layered hybrid construction

  • 50mm open-cell memory foam comfort layer - cool & breathable

  • 2000 (15cm high) encapsulated premium pocket springs provide a gentle & supportive tension

  • 150mm high edge-to-edge support walls prevents the side of the mattress from sagging over long-term use and provides supportive tension tight to the edge of the mattress

  • 50mm high-density foam base foundation layer - making the mattress suitable for all base type

  • Re-Ax thermos-regulating hypoallergenic knitted mattress cover

  • Removable, washable mattress cover

Size and Weight

Available UK Mattress Sizes

Small Single25x75x190 cm22.5 kg
Long Small Single25x75x200 cm25.5 kg
Single25x90x190 cm25.5 kg
Small Double25x120x190 cm31.9 kg
Double25x135x190 cm35.8 kg
King25x150x200 cm41.2 kg
Super King25x180x200 cm47.7 kg

Available EU Mattress Sizes

EU Single25x90x200 cm27.5 kg
EU Double25x140x200 cm38.5 kg
EU King25x160x200 cm44.5 kg
Delivery Information
  • *Free next day or day of choice delivery to the UK addresses 

  • Orders must be placed before 1pm for next working day delivery

  • 2-Person delivery service | Room of choice - additional extra

  • Old mattress removal - additional extra

  • Delivered rolled & bagged for your convenience

  • AM delivery slot (8am - 12pm) - available to choose when checking out

  • Saturday morning delivery (8am - 12pm) - available to choose when checking out

Why not give it a try?

Sleep on it, jump on it and everything in between - it's yours for 100-nights to fall in love with. If it's not right for you, we'll collect for free and refund you in full.

Why not give it a try?

All returned mattresses are directly collected and donated to our partner charity - The British Heart Foundation.

"Great Mattress, very comfortable and keeps me nice temperature. Very reasonable price as well!"


Love it! REM-Fit mattress keeps me cool in the summer, and warm in the winter.


Don’t just take our word for it...

  • REM-Fit Evening Standard

    Evening Standard

    "This is a great mattress"

  • T3 Magazine REM-Fit

    T3 Magazine

    "it's extremely comfortable"

Our mattresses fit all types of bed...

Adjustable Bed

Divan Bed

Platform Top Base

Slatted Bed Frame

How firm is the 400 mattress?

The REM-Fit 400 is classified as a medium - firm tension mattress and is suitable for all shapes, sizes and sleeping positions and will perform perfectly up to a max weight of 20 stone per sleeper (max 2 sleepers). 

How does the 100-night trial work?

We provide a risk-free sleep trial on all our mattresses. This allows you to sleep on a REM-Fit for 100-nights in the comfort of your own home and really put it to the test! There are no catches. If the mattress, for whatever reason doesn’t live up to your expectations, you can send it back for a full refund. There are no collection charges either! View more info here.

How long does delivery take?

We can deliver your new mattress the very next working day providing you place your order by 1pm. You can select a chosen day for delivery if the 'next day' isn't suitable. We have a suit of delivery options to choose from when 'checking out' including weekend and guaranteed AM slots.

Why are REM-Fit springs superior to your counterparts?

Unlike our counterparts we use tall pocket springs constructed from triple tempered steel. Each spring is contained within its own pocket of fabric which prevents the spring system from rubbing against each other, nothing worse than a squeaky mattress! Tall pocket springs compared to mini springs provide superior support and will isolate partner disturbance movement more effectively. Don't worry about feeling the springs through the mattress, you can't, we place them deep beneath the top layers of the mattress so that they are never noticeable.

What base can the mattress go on?

Thanks to the high-density foam layer of the mattress you can confidently use the mattress on any bed base including adjustable beds!

I have a bad back - will this mattress help?

As non-medical professionals we make no guarantees that the mattress will improve your back complaint. However, we have designed our mattress range with a focus on back support. We also receive lots of positive feedback from sleepers who have suffered with a bad back to discover that sleeping on a REM-Fit mattress has relieved their pain and enabled them to get a great night's rest.

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