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King Mattresses

Best King Mattresses UK (2023)

Last updated: 31.10.2023 Reading time: 11.5 Min.

If your bed is feeling a little cramped, then we recommend you throw out your smaller mattress and choose a 150 x 200 cm (5’ x 6’6”) mattress.

The 150 x 200 cm mattress is the standard UK king size mattress, and it's the optimal choice for couples.

You'll find some variations on this size and are likely to also encounter the 160 x 200 cm queen mattress, which is popular in Europe.

Some UK manufacturers and retailers will also stock this size.

But to ensure that your mattress matches your bed frame and bedding, we suggest sticking to standard UK sizes.

If you're looking for the best 150 x 200 cm king mattresses in the UK, then this guide will help you.

150 x 200 cm King Mattresses

Our top recommendations

Sleep Hero Favourite

Simba Hybrid Luxe

The Simba Hybrid Luxe is Simba's most advanced mattress with three tiers of titanium Aerocoil® springs and a breathable bamboo wool top surface.

This mattress features 10 layers and has a height of 31 cm (12 inches) for superior comfort. 

The Simba Hybrid Luxe is Simba Sleep's most advanced luxury mattress.

Simba Hybrid Luxe

With a depth of 31 cm (12 inches), this mattress features an impressive 10 layers, which include:

  • Three layers of conical pocket springs 
  • Three layers of Simba-Pure CertiPUR-certified foam
  • One comfort layer of open-cell graphite-infused Simbatex foam
  • Temperature-regulating wool layer
  • Hypoallergenic knitted cover

Up to 6000 pocket springs with varying sizes ensure that the Simba Hybrid Luxe remains supportive and adapts to your body perfectly, allowing for the ultimate sleep experience. 😴

The knitted cover and bamboo wool layer allow for breathability and superior temperature regulation, keeping you cool and refreshed all night long.

Note: Simba Sleep also offers a spring base with up to 1000 barrel springs instead of the standard Simba foam base. Double-check which option you have selected on the product page before completing your purchase. Find out more in our Simba Hybrid Luxe mattress review.

This luxurious mattress is available in all standard UK mattress sizes. 🇬🇧

The Simba Hybrid Luxe comes with free delivery & returns, a 200-day risk-free trial period, and a 10-year guarantee. 


  Simba Hybrid Luxe
Composition: Pocket springs, Simba-Pure foam, Simbatex foam, wool, bamboo
Firmness level:  Medium-firm
Height: 31 cm (12 inches)
Trial period: 200 days
Guarantee: 10 years
What makes this mattress special? 10 layers of premium materials; temperature-regulating wool & bamboo layer

Nectar Memory Foam Mattress

The Nectar is a luxurious memory foam mattress suitable for most people and sleeping positions.

This bestselling mattress comes with a revolutionary 365-day trial period and a lifetime warranty.

The Nectar memory foam mattress is one of our favourite mattresses.

It features 3 layers of high-quality, high-density memory foam for optimal spinal alignment, pressure relief, and comfort.

The base layer also has 7 contour zones to enhance its ergonomic design and keep your body in a healthy sleeping position. 📏

This prevents a build-up of tension and allows for orthopaedic support.

Nectar mattress
The Nectar is a medium-firm mattress.

The Nectar mattress comes with a breathable cover that enhances airflow to allow for a cool and comfortable sleep. 💨

Unfortunately, the cover is not machine-washable.

We'd suggest using a mattress protector to safeguard your mattress against stains, spills, and bacteria.

The Nectar mattress comes with free delivery & returns, a revolutionary 365-day trial period, and a "forever warranty". 


  Nectar mattress
Composition: Memory foam with a 7-zone cold foam base
Firmness level: Medium-firm
Height: 25 cm (10 inches)
Trial period: 365 days
Guarantee: Lifetime warranty
What makes this mattress special? Exceptionally comfortable for average-weight & lighter sleepers; lifetime warranty & revolutionary one-year sleep trial.
Great For Hot Sleepers

Emma Luxe Cooling Mattress

The Emma Luxe Cooling Mattress is Emma Sleep UK's most advanced mattress with temperature regulation technology.

Conveniently, the Emma Luxe Cooling mattress is available in a range of both UK and EU mattress sizes to meet all your requirements. 

Emma's Luxe Cooling mattress is the latest - and most advanced - mattress by the award-winning Emma Sleep. 🏆

This medium-firm mattress features a total of six mattress layers, which include:

  • A temperature-regulating top cover that's removable and washable
  • A top layer of ThermoSync® foam, infused with graphite particles that capture excess heat to promote temperature regulation
  • A layer of Halo memory foam for body-hugging comfort
  • A transitional layer of supportive foam to reduce pressure points
  • A layer of 12 cm (4.8 inches) Aeroflex pocket springs for breathability, surrounded by foam for superior edge support
  • A base layer of High Resiliency Extra foam for additional support and durability 

This mattress has the perfect medium-firm feel. 🧸🧱

It allows for some sinkage to promote optimal spinal alignment and gives you very targeted support but the mattress still provides enough push-back so you won't feel like you're sinking into the foams.

emma luxe cooling mattress from the top
The Emma Luxe Cooling is a medium-firm hybrid mattress.

Conveniently, the mattress also has excellent edge support, which isn't always the case with bed-in-a-box mattresses.

It features enhanced temperature regulation technologies so you won't feel as hot and clammy on this mattress as you may feel on other Emma memory foam mattresses.

The Luxe Cooling mattress also comes with a removable cover that can be machine-washed at 60℃, which is great for people struggling with allergies or those with hygiene concerns. 💦

You can upgrade the Emma Luxe Cooling to the Emma Luxe Cooling Plus, which includes an advanced temperature-regulating Diamond Hybrid comfort cover. 

The Emma Luxe Cooling mattress is delivered rolled up in a compact box, making it relatively easy to manoeuvre, but be aware that this mattress is on the heavy side. 

emma luxe cooling mattress delivery
The mattress is delivered tightly rolled up in a cardboard box.

Delivery and returns are free, and the mattress also comes with a 200-night trial and a 10-year guarantee.

As an aside: The Luxe Cooling mattress we tested was damaged on delivery, but we had a positive experience with the Emma customer support team, who responded to our request within 48 hours.


  Emma Luxe Cooling Mattress
Composition: Multiple layers of foam, memory foam, and pocket springs
Firmness level: Medium-firm
Height: 25 cm (10 inches)
Trial period: 200 nights
Guarantee: 10 years
What makes this mattress special? Exceptional edge support with a comfortable medium-firm feel.
Luxury Option

DreamCloud Luxury Hybrid

The DreamCloud Luxury Hybrid mattress is a 5-layered premium mattress that combines memory foam with pocket springs.

This is a high-quality mattress designed for enhanced breathability, comfort, and support. 

The DreamCloud Luxury Hybrid is a premium mattress from the same company that's brought you the Nectar memory foam mattress.

It combines high-quality memory foam with full-size pocket springs (called ActiveEdge coils), each measuring 15 cm (5.9 inches).

DreamCloud luxury hybrid

This is an orthopaedically designed mattress with medium-firm support to help eliminate back, neck, and shoulder pains.

The mattress offers enhanced breathability to help keep you cool and refreshed all night long. ❄️

It also has low motion transfer and great edge support, making it a great choice for couples.

The DreamCloud Luxury Hybrid mattress is 28 cm (11 inches) thick and stands out as a key feature in any bedroom. 🏆

The mattress comes with free delivery & returns, a remarkable 365-night risk-free trial period, and a lifetime guarantee.


  DreamCloud Luxury Hybrid
Composition: Memory foam, pocket springs
Firmness level:  Medium-firm
Height: 28 cm (11 inches)
Trial period: 365 days
Guarantee: Lifetime warranty
What makes this mattress special? Fantastic premium-choice option suitable for most; revolutionary trial period and a lifetime guarantee.

How we test products

Our mission is to take the guesswork out of finding the perfect sleep products.

We've dedicated hundreds of hours to testing mattresses and sleep accessories, and rely on a team of testers of differing weights, temperature preferences, and sleeping positions to evaluate each product. 

Tested products are granted the Sleep Hero tested stamp of approval, a mark of our review's reliability.

To learn more about our testing process, check out our methodology page.

If we haven't personally tested a product, please be assured that we invest significant time and energy into scouring the UK market and researching the best recommendations, and we work with a team of sleep experts who review our articles, ensuring that the insights we provide are not only relatable but also reliable.

Who can sleep on a king mattress?

The 150 x 200 cm mattress is the optimal size.

It's not too wide and will fit into most rooms but it's still wide enough to offer two people more than enough space and a comfortable night's sleep.

A mattress of this size can also easily accommodate a baby, child, or pet who may hop into bed from time to time.

Singles can also enjoy the 150 x 200 cm mattress and it's perfect for restless sleepers.

Size 150 x 200 cm
For whom? Singles, couples, guests
Materials? High-quality materials such as latex, memory foam, cold foam, and springs

150 x 200 cm mattress - the optimal size for couples

The 150 x 200 cm mattress is the optimal size for couples.

It's a little bigger than the 135 x 190 cm double mattress and will offer both partners more room to sleep and toss and turn.

This is particularly advantageous if one or both partners are of a larger build or restless sleepers.

The 150 x 200 cm mattress also isn't too wide to not fit into bedrooms. While, of course, some rooms are smaller than others, it should fit into most bedrooms, even in the UK.

150 x 200 cm mattress - for the sleep-loving single

If you love your sleep, then there's no reason not to indulge in a 150 x 200 cm mattress even if you sleep alone.

This mattress offers ample space for you to sleep, read, watch movies, lie crossways, practise yoga - anything, really.

It's also a great choice for very restless sleepers or people of larger build who enjoy their space.

150 x 200 cm for babies, children, and pets who hop into your bed

Do you have a baby, child, or pet that likes to hop into bed with you and your partner?

Then the 150 x 200 cm king mattress is perfect. There will be enough space for everyone to sleep comfortably.

There really is no going wrong with the 150 x 200 cm king mattress. If you have the budget and your room is large enough, then this is the perfect choice for singles and for couples.

UK Mattress Sizes

But wait - what's a queen mattress?

If you've lived or travelled abroad, then it's likely that you've come across queen-size mattresses.

This mattress size is not commonly available in the UK.

The queen-sized mattress is a 160 x 200 cm mattress, most similar to the UK king size mattress.

Take a look at the table below, which should clear up any misunderstandings.

Descriptor UK size European sizes
Queen / 160 x 200 cm
King 150 x 200 cm 180 x 200 cm
Super King 180 x 200 cm /

Different types of materials for 150 x 200 cm mattresses

The 150 x 200 king mattresses are available in many different types of materials.

Not each material will be right for you, the shape of your body, or your preferred sleeping position.

Memory foam

Memory foam mattresses adapt well to the contours of the body and relieve pressure adequately.

They also have very low motion transfer, making them an excellent choice for couples.

Motion transfer refers to movement in the mattress.

Low motion transfer means that movements will be absorbed and not travel across the mattress.

This means that you won't be disturbed by your partner's movements at night.

On the downside, memory foam retains more heat than other types of foam, increasing the overall sleeping climate. This is not ideal for people who easily feel hot or heavy sweaters.

Many memory foam mattresses have a cooler top layer and breathable cover to counteract this.

Latex foam

Latex foam mattresses are very comfortable to sleep on.

They offer a high point elasticity, are great for restless sleepers, and are also much cooler than memory foam mattresses.

Latex also has natural anti-allergenic properties, making it suitable for people prone to allergies.

Natural latex mattresses are also a great choice for people who are looking to invest in a high-quality, durable mattress that's environmentally friendly.

High-quality latex mattresses are considerably more expensive than other mattress models.

Cold foam

Cold foam mattresses are characterised by their high point elasticity, low motion transfer, and stability.

High-quality mattresses only use cold foam as their base layer, which adds stability and firmness to the mattress as a whole.

Pay special attention to the density of the cold foam used and make sure you choose a mattress with a density of 40 kg/m³ and up.

Gel foam

Gel foam mattresses are characterised by their adaptability, high point elasticity, and cooler sleeping climate.

Most high-quality mattresses only use gel foam as the upper comfort layer of a mattress and combine it with firmer and more stable base foams.

This is because gel foam is quite soft and more expensive than other foams.

Innerspring mattresses

Innerspring mattresses come in a wide variety of different styles but they're all characterised by their spring core, stability, and greater breathability.

Spring mattresses are generally firmer than other types of mattresses, making them a good choice for back sleepers, stomach sleepers, and people of a heavier build.

They're also better ventilated and allow for a cooler sleeping climate, making them a good choice for people who easily feel hot at night.

Of the innerspring mattresses, we'd recommend the pocket spring mattresses. Here, springs are wrapped in individual pockets, which makes the mattress more comfortable.

Nowadays, many spring mattresses are available in a hybrid form, combining spring and memory foam to accentuate the advantages of both materials.

Criteria to consider before purchasing a 150 x 200 cm king mattress

If you’re sharing your bed with a partner, it’s essential that each partner has the necessary space to sleep comfortably and move around without disturbing one another.

That said, you also need a mattress that sufficiently supports both partners.

Pay attention to the following key criteria before purchasing your new 150 x 200 cm king mattress.

Support and stability

When choosing your mattress, pay special attention to the support the mattress gives.

You want a mattress that supports your spine adequately and adapts to the contours of your body but still allows you to move around freely.

This is largely influenced by the material you choose.

Memory foam, for example, adapts very well to the contours of your body and ensures that your spine is kept in a healthy alignment. But, it retains more heat than other materials. This may or may not be a problem for you.

The type of material used will affect support and comfort. Each material feels slightly different.

One cannot say that one is better than any other - it is up to each person to find the material that suits them best.

Degree of firmness

Choosing a soft, medium, or firm mattress will depend largely on your personal preference.

There is no right or wrong choice.

In general, though, the larger or heavier you are, the firmer you need your mattress to be. This is to allow for enough support to keep your spine in a healthy alignment.

But as long as your body remains optimally aligned, you can choose whichever degree of firmness you wish.

Other factors that may influence your decision include your age, favourite sleeping position, etc.

We've created a Sleep Hero firmness scale to help guide you through the confusing world of mattress firmness.

Can I buy a cheap 150 x 200 cm mattress?

If you're buying a 150 x 200 cm king mattress, then you'll undoubtedly want your mattress to last a long time.

Never compromise on quality.

High-quality mattresses can last for ten years or longer, so making a bit of an investment is worth it.

After all, the quality of your sleep affects the quality of your life.

Pay special attention to the materials, stability, and firmness of your mattress.

Also ensure that foams used are of a high density. The higher the density, the longer the lifespan of the mattress.

This table on density can be used as a rough guide:

Density (in kg/m³) The expected lifespan of the mattress
Up to 25 Up to 2 years
30 Up to 3 years
35 5 - 6 years
40 6 - 8 years
50 - 60 10 years or longer

But buying a high-quality mattress doesn't mean that you need to sell your arms and legs. There are many high-quality mattresses available at great prices.

Brands like Emma, Eve, or Nectar all offer superb products at competitive prices.

They also all frequently run promotions, so you can save up to 50% on your purchase!

Check out our discounts page for all the current promotions available.

Do you and your partner want different mattresses?

The hardest part of choosing a 150 x 200 cm king mattress to share is that you and your partner may want different things.

What if you easily feel cold at night but your partner is a heavy sweater?

What if you like firm mattresses but your partner likes soft mattresses?

Not finding the right mattress to suit both partners can definitely be a problem.

But, there are some solutions:

Customisable mattresses

These are not widely available but they are slowly becoming more and more common.

For customisable mattresses, you can set individual preferences for each half of the mattress.

So, for example, your side of the mattress may be soft but your partner's side may be firm.

This way, you'll both get exactly what you want.

Take a look at the Tweak mattress as an example of customisable mattresses.

Combining 2 single mattresses

Of course, you can also combine two 90 x 190 cm single mattresses.

If you and your partner have widely different preferences, then you can invest in two single mattresses instead and place them next to each other on the same bed frame.

You can get rid of the gap between the two mattresses by using a bed bridge or a mattress topper.


When choosing your new 150 x 200 cm king mattress, pay special attention to the quality of the mattress.

If you're choosing a mattress of this size, then you'll undoubtedly want to keep it for a long period of time.

High-quality mattresses can last up to ten years or even longer.

Over the long term, making a good investment is worth it.

There really is no going wrong with the 150 x 200 cm king mattress.

If you have the budget and your room is large enough, then this is the perfect choice for singles and for couples.



Content Director & Partner Relations

My mum calls me "bear" because I like to sleep so much. I never thought that, one day, I'd be a certified sleep coach and apply my skills more widely. Can you tell that I've found my calling? 

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