King Mattresses

Best King Mattresses UK (2024)

Last updated: 31.10.2023 Reading time: 8 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 11 premium layers.
  • Pocket springs, Simba-Pure foam, wool & bamboo
  • 31 cm (12 inches)
  • Medium-firm

Tell me more about the Simba Hybrid Luxe

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

This mattress features an impressive 11 layers, including conical pocket springs, Simba-Pure CertiPUR-certified foam, open-cell graphite-infused Simbatex foam, and a temperature-regulating wool layer. 

The Simba Hybrid Luxe remains supportive and adapts to your body perfectly. 

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

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. 

Reasons to buy

High-quality materials 

Machine-washable cover 

200-night trial period 

Reasons to avoid

Very expensive 

Will not fit regular sheets due to its thick depth


Nectar Premier Hybrid

The Nectar Premier Hybrid combines pocket springs, micro springs, and memory foam.
  • Memory foam, micro springs & full-size pocket springs
  • 28 cm (11 inches)
  • Medium-firm support 

Tell me more about the Nectar Premier Hybrid

The Nectar Premier Hybrid mattress is one of Nectar's best-selling medium-firm mattresses, designed for superior comfort and support for all body types. 

This mattress has been designed with enhanced cooling in mind, wicking away moisture and allowing for greater air circulation. ❄️

This helps keep the mattress cooler and more comfortable, making it better suited to hot sleepers or those who sweat easily. 

The combination of up to 2,462  micro springs and full-size pocket springs also aids support and gives you a more stable sleeping surface.

It also comes with a risk-free 365-day trial, giving you the chance to try the product in the comfort of your own home.

Reasons to buy

365-day trial

Lifetime guarantee

Free named-day delivery

Reasons to avoid

Not the best edge support

Great For Hot Sleepers

Emma Luxe Cooling Mattress

The Emma Luxe Cooling Mattress is made with temperature regulation technology.
  • ThermoSync foam, memory foam, & pocket springs
  • 25 cm (10 inches)
  • Medium-firm

Tell me more about the Emma Luxe Cooling Mattress

Emma Sleep's most advanced Luxe Cooling mattress combines six layers of foam and springs for medium-firm support.

It ensures optimal spinal alignment with targeted support and sufficient push-back to prevent excessive sinking.

The mattress offers exceptional edge support, a standout feature not common in bed-in-a-box options.

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 machine-washable cover is ideal for allergy sufferers and hygiene maintenance.

Delivered compactly rolled in a box, though it is notably heavy for easy manoeuvring.

Reasons to buy

200-night trial 

10-year guarantee

Excellent edge support 

Reasons to avoid

The foams retain some heat and feel warmer than non-memory foam products

We experienced some delivery issues during testing 

Luxury Option

DreamCloud Luxury Hybrid

The DreamCloud Luxury Hybrid mattress is a 5-layered premium mattress.
  • Memory foam & pocket springs
  • 28 cm (11 inches)
  • Medium-firm

Tell me more about the DreamCloud Luxury Hybrid

The DreamCloud Luxury Hybrid is a premium mattress from the same company that makes 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).

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 an excellent choice for couples.

Reasons to buy

365-day trial period

Lifetime warranty

Excellent motion isolation for couples

Reasons to avoid

Extra deep sheets required 

Too firm for lightweight side sleepers

The cover is not removable 

Value For Money

Hypnia Supreme Hybrid Mattress

The Hypnia Supreme Hybrid mattress includes an integrated pressure-relieving memory foam topper.
  • Natural latex layer, memory foam & pocket springs
  • 30 cm (11.8")
  • Medium feel

Tell me more about Hypnia Supreme Hybrid mattress

The Hypnia Supreme Hybrid mattress combines different materials for targeted support. 

It includes a memory foam layer for added relief for your joints and natural latex for pressure relief and temperature regulation. 

The pocket springs in 7 support zones maintain spinal alignment and minimise motion transfer. 

The Hypnia Supreme Hybrid mattress offers a medium comfort level, which we rated on the softer side at 5/10 on our firmness scale, where 1 is the softest and 10 is the firmest.

However, the integrated topper makes it an excellent choice for side sleepers.

Delivery is free within the UK, and the Hypnia Supreme Hybrid mattress arrives vacuum-packed, making it easier to manoeuvre. 

Reasons to buy

200-night sleep trial 

15-year guarantee

OEKO-TEX STANDARD 100 certified

Reasons to avoid

It may feel too soft for stomach sleepers

Extra deep sheets required with this mattress

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 [1] 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.

Frequently asked questions



Editor & Certified Sleep Therapist

Nicky is an experienced writer and editor with numerous qualifications. As a certified sleep coach, her interests lie in understanding how sleep problems arise from hormonal and environmental issues, particularly as part of stress and anxiety management.

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