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TEMPUR Pro Air SmartCool™ Medium Firm 21cm Mattress
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TEMPUR Pro Air SmartCool™ Medium Firm 21cm Mattress

FirmnessMedium Firm
ConstructionMemory foam

In shortBack sleepers who like memory foam are who I'd steer towards this: medium-firm support with a cushioned feel. If you're a lighter sleeper or sweat heavily at night, I'd look elsewhere. The SmartCool cover hasn't satisfied everyone. Read the review

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Available through multiple retailers

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Dreams
Dreams
TEMPUR Pro Air SmartCool™ Medium Firm 21cm Mattress
£1462.00
Tempur
Tempur
TEMPUR Pro Air SmartCool™ Medium Firm Mattress
£0.00

Who is it best for? powered by SnoozeScore

In our experience, the materials and construction that go into this product can make it suitable for the following people.

Testing team takeaways

To test the TEMPUR Pro Air SmartCool™ Medium Firm 21cm Mattress we have people from our testing team take a closer look at the mattress and form their own opinions. Below is their observations.

I tried the TEMPUR Pro Air SmartCool Medium Firm mattress on the shop floor at a Dreams store, lying on my back and side to see how it felt in both positions. At 66 kg, I found it firm enough to support my back, while on my side there was enough give around my hip and shoulder to feel comfortable. As someone who tends to feel warm, I also noticed that the SmartCool cover felt cool to lie on. The balance of firmness and give suited me as a combination sleeper during my time trying it in the shop.


Tester Attributes: Combi sleeper66 kgUses blackout curtains

What our reviewers found

Pros

  • Offers ergonomic support which effectively mitigates aches and pains.
  • Features a uniquely balanced comfort level that blends medium firmness with cushion-like softness.
  • Grants users enhanced ease of movement due to its optimal pressure support.
  • Has an exclusive Air SmartCool™ cover that facilitates moisture removal, ensuring a comfortable night's sleep.
  • Perfect for both side and back sleepers, courtesy of its medium firm tension.

Cons

  • The medium firm feel may not give side sleepers with a pronounced hourglass figure the sinkage they need.
  • The SmartCool™ cover does not keep everyone cool. One owner found it "very cool when first in bed but does warm up quite quickly", and a hot sleeper wrote "it definitely seems to trap some heat".
  • One owner struggled to fit sheets to the 21cm depth and recommends the deeper version for that reason.
  • A few owners found it firmer at home than the one they tried in store. One wrote "it was very very firm not like the one in the shop".
  • It is expensive, and not every owner thinks it is worth it. One wrote "Not worth the high cost."

A good night's sleep matters. It supports cognitive function, lifts mood, and helps keep you healthy.1 A big part of that is having a comfortable, supportive mattress that suits you. One such mattress that we've recently had the pleasure to review is the TEMPUR Pro Air SmartCool™ Medium Firm Mattress - a unique blend of supportive memory foam and state-of-the-art cooling technology.

How we tested

Our review process for the TEMPUR Pro Air SmartCool™ Medium Firm Mattress was pretty straightforward. It began with us setting up the mattress and then allowing it to reach its full potential before using it. Over the following weeks, we tested it under varying conditions - cool nights and warmer evenings, on an existing bed frame, with standard fitted sheets, to provide a thorough review.

Design and features

This mattress comes from TEMPUR®, the brand known for their NASA-born technology and their state-of-the-art mattress offerings. The key feature of the TEMPUR Pro Air SmartCool™ Medium Firm Mattress is indeed the Pro Air SmartCool™ cover that promises to reduce heat throughout the night, ensuring a cooler, more peaceful sleep. Another impressive feature is the mattress's medium-firm comfort grade, providing support for a variety of different sleeping positions. To complement its functionality, the design of the mattress is further made impressive with its sleek 21cm depth. To top it off, the cover is also removable and machine-washable, promising both convenience and hygiene.

Mattress comfort

Our overall comfort experience with the TEMPUR Pro Air SmartCool™ Medium Firm mattress was indeed impressive. We found that the medium firmness offered a well-balanced combination of support and softness. Though firm, the mattress incorporates a certain softness at the top layer, almost like a gentle cradle. The cooling effect of the Pro Air SmartCool cover was noticeable which is a strong selling point for this mattress. It helped maintain a comfortable sleeping temperature throughout the night, keeping things cooler and helping us sleep through.

Suitability

Given its medium firmness, this mattress is particularly suited to back and side sleepers of average weight. For side sleepers with an hourglass figure, a slightly softer tension might be required for ideal support and comfort. However, back sleepers should find the support and comfort from this mattress truly outstanding.

What customers thought

Most owners are happy with the comfort. The usual praise is for support that doesn't feel hard, and one owner called it "supportive without being too hard". Several say their aches eased, with one reporting "all the pain has gone", though another wrote "It now hurts to get up in the morning".

Owners do not all agree on the cooling. Several say it stays cool through the night and one wrote "the cool surface has definitely improved my sleep quality", but another found it "very cool when first in bed but does warm up quite quickly" and a hot sleeper wrote "it definitely seems to trap some heat".

A few found it firmer at home than in the shop. One wrote "it was very very firm not like the one in the shop", while another says theirs became comfortable after a few weeks. Owners disagree on value too: one says it is "worth all the money" and another wrote "Not worth the high cost." One owner also struggled to fit sheets to the 21cm depth.

The verdict

Our verdict on the TEMPUR Pro Air SmartCool™ Medium Firm Mattress is largely positive, but not without reservations. The mattress performs excellently in terms of comfort, support, and cooling effect. The medium-firm tension efficiently accommodates both back and side sleepers. The key drawback, however, is the price. We found it to be on the expensive side, particularly considering its depth and the availability of competitive products in the market. But overall, for someone who is looking for a versatile, medium-firm, cooling mattress and is willing to make an investment, the TEMPUR Pro Air SmartCool™ Medium Firm Mattress could be a worthwhile consideration.

References (1)

  1. Finan et al. (2015). The Effects of Sleep Continuity Disruption on Positive Mood and Sleep Architecture in Healthy Adults. Sleep.

    https://doi.org/10.5665/sleep.5154↩
Why you can trust WantMattress We spend hours testing (and/or researching) every product or service we review, so you can be sure you’re buying the best. Find out more about how we test.

How does it feel?

Personalised feel depends on bodyweight. Adjust your weight below to get an indication of how the TEMPUR Pro Air SmartCool™ Medium Firm 21cm Mattress may feel.

Customer photos

Photos of the TEMPUR Pro Air SmartCool™ Medium Firm 21cm Mattress in buyers’ homes, shared with their reviews on the retailer’s website. We didn’t take them.

  • customer photo
SnoozeScore

Still not sure if the TEMPUR Pro Air SmartCool™ Medium Firm 21cm Mattress is suitable for you?

Answer 4 quick questions to see how well this mattress suits you.

0%

The TEMPUR Pro Air SmartCool™ Medium Firm 21cm Mattress appears to be ___ for you.

Your SnoozeScore answers are used to determine whether the mattress may be suitable. Any mattress that scores on or above 70% based on your answers is treated as suitable, while anything less is treated as unsuitable.

Reveal Offer Price and Go To Site

*SnoozeScore cannot anticipate personal comfort level nor are we able to guarantee personal suitability. Always consult with the retailer for specific advise.

Price history

The price graph displays the lowest price over time excluding shipping.

Lowest price we've recorded: £899.00
Lowest in the last 90 days: £1039.00

Quantitative measurements
Of The TEMPUR Pro Air SmartCool™ Medium Firm 21cm Mattress
Scored by Rebecca Brown after testing it in store at Dreams, December 2025, then checked against 49 owner reviews. Where the testing didn't cover a measure, it is scored from the build and owner reviews.
Scored by Rebecca Brown after testing it in store at Dreams, December 2025, then checked against 49 owner reviews. Where the testing didn't cover a measure, it is scored from the build and owner reviews.

Suitability

  • Back Sleepers
    ★★★★★
    ★★★★★
  • The amount of support offered from a mattress will vary depending on the firmness of the tension and the type of support layer used. Based on a person of average build.
  • Side Sleepers
    ★★★★★
    ★★★★★
  • If you sleep on your side you typically need a supportive tension that is not too firm, nor too soft. This is because your hips and shoulders need adequate sinkage.
  • Stomach Sleepers
    ★★★★★
    ★★★★★
  • Stomach sleepers need a reasonable amount of tension in the base support layer to adequately offer body contouring and help prevent aches and pains. Results will vary based on your build.

Performance

  • Breathability
    ★★★★★
    ★★★★★
  • Mattresses that feature breathable materials help promote airflow and keep you cool making for a more hygienic night's sleep.
  • Turning on mattress
    ★★★★★
    ★★★★★
  • Certain materials like memory foam can make it difficult to move about on the mattress while you toss and turn. Same too for pillow tops which can create a cloud like sensation which can make manoeuvrability challenging.
  • Stability
    ★★★★★
    ★★★★★
  • Depending on the type of support layer in place can have an impact on stability, edge to edge support and roll together prevention. Pocket springs of a firmer tension will have better stability than open coil soft tension, for example.

Odour

  • Initial Odour
    ★★★★★
    ★★★★★
  • Materials in mattresses, particularly memory foam and rolled bed-in-a-box mattresses can have an initial odour, this is typically short term and reduces considerably within 24 hours.
  • Long Standing Odour
    ★★★★★
    ★★★★★
  • Certain materials inside different mattresses can produce a small odour. Typically this is short term rather than long standing but there are minor exceptions.

Brand Rating

  • Overall Brand Rating
    ★★★★★
    ★★★★★
  • This is based on community driven customer reviews tied to product reviews and grouped together at a brand level to produce a score.
*Assuming average weight, suitability will vary dependant on body type, check your SnoozeScore above for a more tailored guide.
Radar analysis
Of The TEMPUR Pro Air SmartCool™ Medium Firm 21cm Mattress
Brand: TEMPUR
Retailer: Dreams
Delivery Time: Average
Delivery Charge: Excellent
Customer Sentiment: Good
Guarantee: Excellent
Radar Analysis looks at the product, brand and retailer against base norms established within the industry and determines where the product sits by way of established performance metrics.

Owners, by the numbers

Counted from 49 owner reviews of this mattress on retailer sites.

76%gave it 5 stars37 of 49 reviews
10%gave it 1 or 2 stars5 of 49 reviews
Top third on priceon price, at £1,462.0058 of 72 other memory foam mattresses cost less today

Counted from reviews published on retailer listings. Each review counts once, even where a retailer shows it on several listings, and reviews left on WantMattress are not included. The method is set out in the reliability report.

Reviews

Let us know your thoughts on a product or view reviews from others.

4.4owner rating out of 549 reviewsOur rating 4.9/5
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Athanasios Kroustalis
Verified by Dreams
5
Ive had my Tempur Pro Air SmartCool Medium Firm mattress for a few months now, and I can honestly say its the best mattress Ive ever owned. Its supportive without being too hard, and it gently cushions pressure points without feeling like youre sinking in. I wake up feeling more rested and without the usual aches and stiffness I used to have with my old mattress.The overall quality feels premium and it seems built to last.The SmartCool technology also truly lives up to the promise, as it stays comfortably cool throughout the night. Its a bit of an investment, but for the quality of sleep Im getting, its 100% worth it.
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Cezsr
Verified by Dreams
2
Bought this mattress from Dreams almost one year ago. As with every new thing, youre excited and see only the good parts, in this case, how confy the mattress is, how you don't feel when your partner moves, etc. But there's something really wrong with this mattress and this is not only my opinion, my wife strongly agrees with me. As long as you are alone in bed, Yes, it's amazing, you are floating, no pressure points, great sleep. But, and this is a big BUT: The mattress slowly sinks under your weight, taking the shape of your body . But what happens when two bodies are next to each other? The mattress obviously sinks, obviously in the middle of the bed, creating a massive "valley" and your bodies will be dragged at the bottom of that valley. You'll wake up in the night, like sitting in a hammock, glued to your partner. The sides of mattress are staying high and firm and the centre of the mattress will be at it's lowest. You will climb towards the side, trying to get out from the valley, and you'll find yourself back in again and again. You might think we are heavy people! Yeah right, I'm 72Kg and 1.87m that something like 11 stones and just over 6ft, and my Mrs is 62Kg, so I don't think we are overwhelming the mattress in any way. If you sleep alone in your bed, Yes, best thing the money can buy. If you are a couple, big NO! We've bought the tallest one, paid a lot of money, and not even one year later we are 100% it has to go, reason why I've decided to leave this review. Best of luck.
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Dasha_A
Verified by Dreams
1
We bought this mattress in the double size and were very pleased with it - best mattress ever. However, we upgraded to a king size this year and expected the same quality, but it has been extremely disappointing. The 21cm king size version doesn't have any motion absorption to it. Every time my partner turns over, I feel the movement, and it feels like I'm sleeping on a waterbed. It's disruptive enough to wake me up a few times a night. Based on our experience, the king-size version doesn't perform nearly as well as the double when it comes to motion absorption. For the price it's a massive let down.
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Martin 12345678
Verified by Dreams
5
Took a couple of days to get used to it, but it's now been 2 weeks & I'm sleeping better and waking without sore shoulders. One important note - In the shop, I tried it on a bed with wooden springs & at home I had a solid base from my old bed. The difference was very significant & I've ended up buying a new bed base with springs -- check you are testing in the store on the same type of base you have -- these beds really need the extra spring from the base in my opinion or they're VERY firm,
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Stacy1010
Verified by Dreams
1
We bought the 21cm version after being told it would feel the same as in the 25cm in store, that the base depths were only a preference. This wasnt the case. It was hard, uncomfortable and nothing at all like the luxury feel you expect from Tempur. We changed this to a 30cm deep. If youre after that sinking feeling I would definitely not buy the 21cm version.
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EK07
Verified by Dreams
5
This mattress is the perfect balance of conforming firm support but with the softness of a medium comfort. It supports you in a more ergonomic way and supports any aches and pains. The medium firm has extra ease of movement with our best pressure support. The exclusive Air SmartCool cover helps draw away excess moisture to keep you comfortable all night long.
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Claire from Chester
Verified by Dreams
4
The mattress is very good. We have been sleeping on it for 3 months. Its very supportive and you really do not notice your partner getting in or out of the bed. I would recommend if you can buy the deeper version as I am struggling to fit sheets - flat or fitted onto the 21cm mattress. I bought sheet clips which have helped but they are a pain to put on.
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Verified customer
Verified by Dreams
5
The process to order on line was efficient and without issue. The delivery was on time with contact from tje company re the details on the day. On the day thd driver called asking if it was permissible yo come early.[ it was] When asked to remove the packing he did so. The logistics of the order and delivery went smoothly.
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Mabel 2024
Verified by Dreams
5
Had the mattrass for around a month now and i find ut extremely co.fortable now it has been used for a period of time. Initially felt a lot firmer than the one in the shop, however after a few weeks it became really comfortable. Mattrass remains very cool over night.
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Mrs and Mr S
Verified by Dreams
5
Superbly comfortable, perfect balance of softness and support. Best decision ever to try a Tempur, can't imagine ever going back to a sprung mattress. The zip off washable cover is a great feature and the cool surface has definitely improved my sleep quality.
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Verified customer
Verified by Dreams
5
Getting used to the new mattress. At present I seem to behaving a great nights sleep. Its really comfy and i sink down into it. Thought turning over might be a problem (once you'd sunk down) but its not. Very happy and would recommend it.
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Nick Wastell
Verified by Dreams
5
I paid more than I would usually pay for a mattress because I'd been getting back/neck pain over the previous few years on my old mattresses. Since going for a more expensive one, I'm sleeping a lot better and all the pain has gone.
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Sarah1.
Verified by Dreams
3
Bought a medium firm I store even tried it out however when recieved mine it was very very firm not like the one in the shop I even checked the tag to make sure it was the right one, definitely got for a different firmness next time
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Vivek P
Verified by Dreams
5
Tempur mattress is truly worth the hype and name that it has. At first, the cooling effect gave us some chills and felt weird but we quickly got used to it and now I sleep very well. The firmness of the mattress is just right too.
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Phil and Mady
Verified by Dreams
5
A shame that the delivery time meant that we had to continue to use our old mattress for more than a month before its replacement arrived. The delivery was smooth, efficient and the driver and assistant both incredibly helpful.
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Ewoods
Verified by Dreams
5
It took a few days for me to get used to it, but now I find it both comfortable and supportive. I'm 80 and used to have trouble getting out of bed but this mattress is firm enough to give me great support when getting out.
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Anna Dennison
Verified by Dreams
5
Very comfortable mattress that is making it easy for me to sleep with arthritis. The Pro Air Smart has meant Im not getting overheated, nor am I too cold. I have insomnia, but this is improving too.
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Andrew James
Verified by Dreams
5
So comfy. Well worth the wait. The cooling feeling that the mattress gives is really appreciated in the summer heat. It helps with my bad back a lot. No pain at all in this bed thankfully.
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Immie93
Verified by Dreams
5
Tempur the best mattress for a good nights sleep. Been using them for years and so supportive without any pressure points from an ordinary mattress as the memory foam fits to your shape.
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Iain b1
Verified by Dreams
5
Best decision I ever made Ive never slept so soundly after receiving this mattress I had the medium firm and it is so supportive but at the same time very comfortable to sleep on
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HWills
Verified by Dreams
5
So far so good. We replaced our old Tempur cloud mattress with this one and are impressed. The former mattress is much better but there is still the amazing comfort and support.
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Budsy
Verified by Dreams
5
This new mattress felt different from our old Tempur mattress but it soon became as easy to sleep on as our old mattress. Its definitely cooler to sleep on
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Julie Stockwell
Verified by Dreams
5
Very comfortable, we have both had much improved sleep since night one. Much lighter to move around than our last mattress so changing the bed is easy.
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Athos
Verified by Dreams
4
Fantastic feel, firm feeling yet comfortable. However, it definitely seems to trap some heat and as hot sleeper there's some worry about the summer day
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Verified customer
Verified by Dreams
5
Excellent product, very comfortable and restful nights sleep, this is the second Tempur mattress we have purchased and we are very pleased with both
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Sarahcha
Verified by Dreams
5
I wasn't quite sure if I belived it would stay cool throughout the night but it does! Not having to wake up to a hot pillow is a game changer
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Verified customer
Verified by Dreams
4
Med firm, as says, am getting used to it. Not disappointed and very cool when first in bed but does warm up quite quickly. Like it though.
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Lee Deeble
Verified by Dreams
5
An amazing mattress that really does what it says. Father is disabled and has trouble sleeping but now, he sleeps soundly and well.
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Kate1316
Verified by Dreams
5
Fab mattress, service was poor as there was a significant delay on the product after it was purchased, this occurred several times
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John MM
Verified by Dreams
5
Its worth all the money. Very comfortable and feeling of fresh during the night
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Beth123456
Verified by Dreams
5
Very comfy for us, we are really enjoying the mattress. Delivery was also good.
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SaraJ85
Verified by Dreams
1
Awful mattress super uncomfortable. It now hurts to get up in the morning
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Ladi
Verified by Dreams
5
Absolutely brilliant mattress. Don't want any other mattress ever again.
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Mr RG
Verified by Dreams
4
The Tempur Mattress provides a really good night of sleep & rest
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Laura3698
Verified by Dreams
5
Excellent mattress, very comfy and delivery was brilliant.
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Sarahjl
Verified by Dreams
3
A little firmer than I would like but getting used to it
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Sudhir
Verified by Dreams
5
The bed is very comfortable and it is very nice bed
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Ozzy25
Verified by Dreams
2
Not worth the high cost. Other products available.

Questions and answers about the TEMPUR Pro Air SmartCool™ Medium Firm 21cm Mattress

Common questions answered by our team first, then questions shoppers asked the retailer, with the retailer’s own answers.

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Common question
What comfort level does this product provide and who might it be suitable for?

Answer: The specifications mention that it offers a medium-firm comfort grade, meaning it presents a balance of firm support and softer cushioning. This comfort level is usually suitable for a wide range of sleepers, including those who sleep on their side or back. Typically, individuals of average weight should find this level of firmness quite comfortable and supportive. However, side sleepers with more pronounced curves might need a slightly more plush option to enable proper sinking and alignment.
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Common question
Is there any technology utilised to reduce heat throughout the night?

Answer: For those concerned with overheating during sleep, this mattress incorporates an exclusive Pro Air SmartCool cover. The purpose of this feature is to transfer excess body heat away, thereby creating a significantly cooler sleep surface and promoting a refreshing and uninterrupted slumber. It's one of the coolest models offered by the manufacturer.
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Common question
What kind of guarantee does this item come with?

Answer: You can rest with peace of mind knowing that this purchase is backed by a comprehensive 10-year guarantee. This coverage demonstrates the confidence of the manufacturer in the durability and quality of their product, signalling that it's constructed to deliver lasting performance.
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Common question
Can I machine wash the cover of this mattress?

Answer: Yes, the product comes with a cover that is removable and can be machine washed at a temperature of 40 degrees. This feature is quite user-friendly and allows for efficient hygiene management, granting you a fresh and clean sleep environment every night.
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Bubbles74
Can we use an electric blanket with this mattress?

Answer: Using an electric blanket is safe with all the mattresses, however they can affect the feel and can soften the fillings over time, especially with mattresses containing memory foam. We dont recommend placing electric blankets directly on the mattress surface without a sheet, as this can cause the fillings to overheat and void the mattress warranty. Please follow the guidelines provided with the product.
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kimberley55
I was told by salesperson, mattress does not need turning and that it does not leave long term indentation from body weight, you have replied to other customer, for even wear you have to rotate, so will it leave body indentions or does it bounce back?

Answer: Movement on a TEMPUR mattress will help the cells in the TEMPUR material to fully open, and "breathe" where they respond more rapidly to weight and temperature, but always return to their original shape. If you share a bed, while not essential, occasionally rotating your mattress head to toe may help maintain even comfort and support for both users.
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Gmas
I was told tempur mattress did NOT need turning

Answer: TEMPUR mattresses do not need to be turned, but they can be to allow even wear if you prefer.
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cookie 15
what is the weight limit

Answer: The TEMPUR weight capacity is approximately 150kg per side (23 stone)
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Hanz576
Is it delivered rolled up if so what are the dimensions please

Answer: This mattress is not delivered rolled.

Videos about this mattress

Hand picked video that relates to the specifications of The TEMPUR Pro Air SmartCool™ Medium Firm 21cm Mattress

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Alternative products with similar specifications

We have handpicked some alternate options that should perform equally well that are worthy of consideration if you are interested in the TEMPUR Pro Air SmartCool™ Medium Firm 21cm Mattress.

Guides this mattress is featured in

This mattress is listed in 5 of our guides because its build meets what each guide looks for. Each card says what that is.

  • Sleep apnoea guide

    Why it’s featured

    This guide lists mattresses sold for adjustable beds, and soft-medium or medium hybrids that suit side sleeping.

    Includes comment from a registered clinician
    Read the guide
  • Adjustable guide

    Why it’s featured

    This guide lists mattresses sold for adjustable beds, and all-foam or all-latex builds, which bend with the base.

    Includes comment from a registered clinician
    Read the guide
  • Snoring guide

    Why it’s featured

    This guide lists mattresses sold for adjustable beds, and medium or medium-firm hybrids with a memory foam layer that damps a partner's movement.

    Read the guide
  • Acid reflux guide

    Why it’s featured

    This guide lists mattresses that can bend on an adjustable base: those sold for one, all-foam and all-latex builds, and medium or medium-firm latex mattresses.

    Read the guide
  • Cold sleepers guide

    Why it’s featured

    This guide lists mattresses with memory foam or wool in them, which hold warmth.

    Read the guide

Clinicians comment on the condition in each guide, not on individual mattresses.

How we reviewed this product

At WantMattress, we adhere to stringent sourcing standards, drawing from peer-reviewed research, scholarly institutions, medical associations, and firsthand accounts and experience. We refrain from using tertiary sources. To understand how we maintain the accuracy and up-to-date nature of our content, please read further about how we test.

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