Emma® King Size Mattresses

Why choose an Emma® king-size mattress?

An Emma® king-size mattress is a great choice if you want more space, but still want the convenience of a mattress-in-a-box. The larger size gives you more room to turn over, stretch out or share the bed without feeling as close to the edge.

The main choice is feel. Some Emma® models offer closer foam cushioning, while others combine foam comfort layers with pocket springs for a more responsive surface. If you share the bed, it is worth comparing edge support, cooling features and how well the mattress reduces movement travelling from one side to the other.

How to choose the right Emma® king-size mattress

Start with how the mattress will be used. A couple who shares every night may want more space, good motion control, edge-to-edge support, and cooling features, while a solo sleeper may focus more on feel, firmness, and value.

Then compare:

• Mattress type: Choose an Emma® Original Classic Mattress for contouring comfort, or a hybrid-style mattress like the Emma® Original Elite Mattress for foam comfort with added spring support.

• Partner movement: If you share a king-size bed, look for features that reduce movement when one person turns over or gets up.

• Cooling: Compare breathable foams, spring layers and cooling technologies if one or both sleepers tend to feel warm.

• Support: Look for zoned support if you want the mattress to feel more tailored around the shoulders, hips and lower back.

• Setup: King-size Emma® mattresses arrive boxed and rolled, but they are still larger and heavier than smaller sizes, so it is worth having two people ready to move and unbox the mattress.

Why shop at MattressNextDay?

Next day delivery - Choose an in-stock Emma® king-size mattress and get free next-day delivery across the UK mainland.

Lowest price promise - Compare Emma® king-size mattresses with extra price reassurance before you order.

Old mattress removal - Add old mattress removal at checkout and avoid moving a bulky king-size mattress yourself.

Excellent reviews - Compare verified customer reviews before you buy.

Award-winning retailer - Order from a three-time NBF Online Bed Retailer of the Year.

British-designed quality - Choose British-designed mattresses built with carefully selected materials.

Need help choosing your next mattress?

Tell us how you sleep, whether you share the bed and the feel you prefer. MattressFinder™ will help narrow the range to mattresses that suit your sleep needs. Find your perfect mattress.

Buying guidance for Emma® king-size mattresses

Who is an Emma® king-size mattress best for?

An Emma® king-size mattress is best for sleepers who want more room than a double, without moving up to a super king. It can work well for couples, taller sleepers and solo sleepers who like plenty of space.

If you share the bed, focus on steadiness, edge support and cooling. A good king-size mattress should make the full width feel usable, so both sleepers can settle comfortably without feeling pushed into the middle.

What size is an Emma® king-size mattress?

An Emma® king-size mattress measures 150cm x 200cm, which is the standard UK king size. It is also known as a 5ft mattress.

This size is wider and longer than a standard double, giving couples more space to stretch out and taller sleepers extra length. Before ordering, measure the inside of your bed frame to make sure it is a standard UK king size.

A UK king size is not the same as a Euro king. A UK king usually measures 150cm x 200cm, while a Euro king is often 160cm x 200cm. If your bed frame was bought from a European retailer, check the exact dimensions before choosing your mattress.

What Emma® features matter most for couples?

If you share a king-size bed, the right features can make the extra space feel more useful. Look for movement control if one person turns over often, edge support if you both use the full width, and cooling features if the bed tends to feel warm with two sleepers.

Emma® mattresses can include breathable comfort layers, zoned support and cooling technologies depending on the model. Zoned support can help the mattress feel more tailored around areas such as the shoulders, hips and lower back, while still keeping the surface comfortable.

Setting up your Emma® king-size bed-in-a-box mattress

Emma® king-size mattresses arrive compressed and rolled, which makes delivery easier than moving a full-size mattress through the house.

A king-size mattress is still larger and heavier than a single or double, so it is best to move the box with two people if you can. Place the box in the bedroom before opening it, then carefully remove the packaging and unroll the mattress on the bed base.

Give the mattress time to expand before use. It may start taking shape quickly, but it can take longer to fully settle. A slight “new mattress” smell can happen after unpacking and should usually fade with ventilation, so open a window and let the room air before making the bed.

Delivery, recycling, and guarantees

Free next-day delivery to most locations - Get your Emma® king-size mattress quickly, with free next-day delivery available across the UK mainland on in-stock models.

Free weekend delivery - Choose a weekend delivery slot, if available, so the mattress arrives when it is easier for someone to be home.

Choose a delivery date - Pick your preferred delivery date at checkout, making it easier to prepare the room and clear the old mattress.

Learn more about our delivery and returns policies.

We make old mattress disposal easy for you

Just £39 to responsibly dispose of your old mattress - Add old mattress removal at checkout, and MattressNextDay will collect your old mattress when your new one arrives.

100% of your mattress is reused and recycled - Every mattress is broken down into its core components so the raw materials can be repurposed rather than sent to landfill.

A greener way to get rid of your old mattress - Avoid moving a bulky king-size mattress yourself and choose a recycling service designed to fit around your delivery.

Find a great value Emma® king-size mattress

Looking for award-winning comfort in a roomier size? Explore the latest MattressNextDay sale and compare Emma® king-size mattresses by feel, support type, delivery availability and guarantee. Shop mattress sale.

Ask the expert about Emma® king-size mattresses

Choosing a mattress is easier when you know what to compare. Our sleep experts answer common questions about Emma® king-size mattresses, including size, UK vs Euro king dimensions, foam vs hybrid models, setup and delivery.

Martin Seeley, Product Expert at MattressNextDay, answers questions about Emma® king-size mattresses.

Is a UK king the same as a Euro king?

No. A UK king-size mattress usually measures 150cm x 200cm, while a Euro king is often 160cm x 200cm.

Always measure the inside of your bed frame before ordering, especially if the frame was bought from a European retailer.

What bed base should I use with an Emma® king-size mattress?

Emma® king-size mattresses can usually be used with suitable slatted frames, divans and ottoman beds, but the base should be flat, supportive and in good condition.

If you are using a slatted frame, check the slat spacing and replace damaged or bowed slats. A divan base can create a steadier feel, while sprung slats may add a little more give.

A worn or uneven base can affect how the mattress feels and wears over time, so it is worth checking the frame before your new mattress arrives.

Emma® Original vs Hybrid vs Luxe: Which king-size should you choose?

Emma® king-size mattresses are designed around different comfort needs, from everyday support to more advanced cooling and pressure-relieving designs. Availability can change, so always check the product grid and individual product pages before choosing.

An Emma® Original-style mattress may suit you if you want dependable Emma® comfort with a balanced, supportive feel.

An Emma® Hybrid-style mattress, like the Emma® Original, Emma® Original Lite, Emma® Original Pro or Emma® Original Elite, may suit you if you want foam comfort with added spring support, more airflow and a more responsive feel.

An Emma® Luxe or advanced Emma® mattress may suit you if you want extra comfort layers, more advanced cooling technology or a more premium feel.

Does an Emma® king-size mattress need two people to set up?

It is a good idea. Emma® mattresses arrive boxed and rolled, but a king-size mattress is still larger and heavier than smaller sizes.

Moving the box into the bedroom and unrolling the mattress is usually easier with two people.

What Emma® features help with cooling and pressure relief?

Emma® mattresses can include breathable comfort layers, cooling technologies and zoned support. Zoned support can help keep your spine in a more natural position while cushioning pressure points such as the shoulders and hips.

If you share the bed or tend to feel warm at night, compare the cooling features and materials listed on each product page.

Do Emma® mattresses come with a guarantee?

Yes, Emma® mattresses come with a 10-year manufacturer’s guarantee. Check the individual product page and terms before ordering, as conditions can apply.

Can I get next-day delivery on an Emma® king-size mattress?

Yes, in-stock Emma® king-size mattresses are available with free next-day delivery across the UK mainland. See our delivery page or individual product pages for the latest information.