Why choose a super king mattress?
A super king mattress gives you the most sleeping space of the standard UK mattress sizes. At 180cm wide, it gives each person around 90cm of space when shared by two people - roughly the same width as a single mattress each.
That extra room can make a real difference if you or your partner move around at night, prefer different sleeping positions or simply don’t want to feel crowded in bed. The 200cm length also gives taller sleepers more room than a standard double mattress.
Whether you're looking for responsive pocket springs, body-contouring foam, or breathable hybrid layers, we stock trusted brands including Silentnight, Coolflex®, Hypnos, Emma and Sealy.
A super king mattress can offer:
A generous 180cm x 200cm sleeping surface
Around 90cm of width per person when shared by two
More personal space for couples who move around at night
Extra length for taller sleepers compared with a standard double
Plenty of room when children or pets occasionally join you
A wide choice of pocket sprung, memory foam, hybrid and natural-filled designs
Different firmness levels, from soft through to extra firm
How to choose the right super king size mattress
Start with how you want your mattress to feel. A super king gives you plenty of room, but the right mattress still depends on firmness, comfort layers, support system and how the surface responds when you move.
If you share your bed, think about both sleepers. Look for a super king mattress that feels comfortable across the whole surface, limits movement travelling from one side to the other and offers good edge support, so you can make the most of the full 6ft width.
Firmness and comfort
Firmness describes how soft or supportive a mattress feels, while the comfort layers affect how much cushioning you feel at the surface.
Use the table below as a starting point, then check the individual product details before ordering.
Firmness | Best suited to | Typical feel |
Soft | Lighter and side sleepers | Plush with deeper cushioning and more sink |
Medium | Side and combination sleepers | A balanced feel with cushioning and support |
Medium firm | Back and combination sleepers | More supportive with gentle cushioning |
Firm | Front sleepers and firmer-feel fans | Stable and supportive with less sink |
Your body weight can change how firm a mattress feels. A medium-firm mattress may feel softer to a heavier sleeper and firmer to someone lighter, so treat the firmness rating as a guide rather than a guarantee of comfort.
Mattress type and construction
Construction affects how a super king mattress responds, supports and manages temperature.
Pocket springs can help each side of the mattress respond more independently, which is useful when two people share a bed. Memory foam creates a closer, more cushioned feel and can help soften movement at the surface. Hybrid mattresses combine spring support with comfort layers, while natural fillings can appeal if breathability and material choice matter to you.
Compare mattress types by firmness, depth, and comfort fillings rather than choosing based on one feature alone. Two super king mattresses can have the same firmness rating but feel quite different because the construction underneath is different.
Why shop at MattressNextDay?
Next-day delivery - Eligible in-stock super king mattresses can be delivered across the UK mainland as soon as the next day.
Lowest price promise - Compare super king size mattresses with extra reassurance on price.
Old mattress removal - Add our removal service, and we’ll take your old mattress away when your new one arrives.
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Buying guidance for super king size mattresses
What size is a UK super king size mattress?
A standard UK super king size mattress measures 180cm x 200cm, or 6ft x 6ft 6in. This makes it 30cm wider than a king size mattress, while both sizes are the same 200cm length.
Mattress size | Metric dimensions | Imperial dimensions | Good for |
Double size mattress | 135cm x 190cm | 4ft 6in x 6ft 3in | Smaller bedrooms, guest rooms and solo sleepers |
King size mattress | 150cm x 200cm | 5ft x 6ft 6in | Couples, taller sleepers and main bedrooms |
Super king mattress | 180cm x 200cm | 6ft x 6ft 6in | Larger bedrooms and maximum shared space |
Always check your bed frame before ordering. Some European or imported frames use different measurements, so measure the inside of the frame rather than relying on the size name alone.
Will a super king size mattress fit your room?
A 6ft mattress gives you plenty of sleeping space, but it also needs more floor space than a double or king.
Before buying, measure both the bedroom and the route to it, particularly if the mattress is deep, heavy or delivered flat rather than rolled.
Before ordering, check:
The full 180cm x 200cm mattress footprint and the dimensions of your bed frame
Space to walk around the bed and open wardrobes, drawers and doors
Bedroom doorways, hallway corners, stairs and landings
Lift dimensions if the mattress is going into an apartment
Whether the mattress arrives rolled or flat on the individual product page
Mattress depth, especially if you need extra-deep fitted sheets or want to control the finished bed height
A rolled super king mattress can be easier to move through tighter spaces, but it still needs enough room to expand once unpacked. Traditional flat mattresses can be heavier and more awkward to manoeuvre, so checking access before delivery can save problems later.
Choosing a super king size mattress for two
A super king mattress is a great option for couples who want more personal space in bed.
At 180cm wide, each sleeper gets around 90cm of space when two people share the mattress. That’s roughly the width of a standard single mattress each, giving you more room to turn over, stretch out or sleep in different positions without feeling crowded.
If you share your bed, pay particular attention to motion isolation and edge support. Motion isolation can help reduce movement travelling across the mattress when one person turns over or gets up. Edge support can make more of the full mattress width feel usable, especially if one of you tends to sleep close to the side.
Couples may want to compare:
Pocket sprung or hybrid designs, where springs can respond independently
Memory foam or substantial comfort layers that can help soften movement
Reinforced edges, if you want the full 6ft width to feel stable
Medium-firm options if you both want a balance of cushioning and support
Zip and link options, where available, if access or different comfort preferences are a priority
Comfort is personal, so a mattress that suits one couple may not suit another. Compare firmness, construction and comfort layers together, then check the individual specifications and reviews before ordering.
Which super king size material should you choose?
The right material depends on how you like your mattress to feel and what matters most while you sleep.
Mattress type | How it works | May suit you if |
Pocket sprung | Individual springs respond separately to pressure and movement. | You want responsive support and reduced movement between sleepers. |
Memory foam | Foam contours around the body and cushions pressure points. | You prefer a closer, body-hugging feel with less bounce. |
Hybrid | Springs are combined with foam, gel or other comfort layers. | You want sprung support with added cushioning and airflow. |
Natural fillings | Materials such as wool, cotton or other fibres are used in the comfort layers. | Breathability and natural materials are high on your list. |
Construction is only one part of the decision. Firmness, depth, comfort layers, your bed base and your body weight can all influence how a Super King size mattress feels in practice. For help choosing the right mattress for you, check out our comprehensive mattress buying guide.
Looking after your super king size mattress
Read the care instructions supplied with your mattress before turning or rotating it. Some super king size mattresses are single-sided, while others may need regular turning, so it is always best to follow the guidance for the model you choose.
If your mattress has handles, use them for positioning rather than carrying its full weight. A super king mattress can be particularly heavy and awkward to move, so it’s a good idea to have two people available if it needs repositioning.
Using a suitable super king bed base and a mattress protector can also help keep your mattress in better condition. Warranty and guarantee terms vary by product, so check the individual product page and manufacturer guidance before ordering.
Delivery, recycling and guarantees
Free next-day delivery to most locations - Need your super king size mattress quickly? Free next-day delivery is available across the UK mainland on eligible in-stock mattresses.
Free weekend delivery - Select a weekend delivery slot, if available, to make receiving your new mattress easier.
Choose a delivery date - Choose your preferred delivery date at checkout to plan around work, moving home or replacing your old mattress.
We make old mattress disposal easy for you
Old mattress collection for £39 - Add old mattress removal for £39 at checkout and we will collect your existing mattress when your new one is delivered.
100% of your mattress is reused and recycled - Your old mattress is separated into its core materials so 100% of its components can be reused and recycled.
A greener way to get rid of your old mattress - Avoid arranging a separate bulky waste collection and choose a convenient recycling service that takes care of your old mattress for you.
Find a great value super king size mattress
Looking for a super king mattress at a price that suits you? Explore the latest MattressNextDay sale and compare offers across trusted brands, firmness levels and comfort options. Shop mattress sale.
Ask the expert about super king size mattresses
Not sure which super king size mattress is right for your room? Find clear, practical guidance on sizing, firmness, mattress type, delivery access and sharing a bed before you order.
Martin Seeley, Product Expert at MattressNextDay, answers questions about super king size mattresses.
What size is a super king size mattress in the UK?
A UK super king size mattress measures 180cm x 200cm, or 6ft x 6ft 6in.
The bed frame itself may be slightly larger than the mattress, so check the full product dimensions before ordering.
Is a super king mattress bigger than a king size mattress?
Yes. A super king mattress is 30cm wider than a standard UK king size mattress.
A king measures 150cm x 200cm, while a super king measures 180cm x 200cm. Both are the same length, but the super king gives each sleeper more width when sharing.
Is a super king mattress good for couples?
Yes, especially if you both like plenty of personal space. A super king gives each person around 90cm of width when shared by two people.
If you share a bed, compare motion isolation, edge support and firmness as well as overall size.
What firmness should I choose for a super king mattress?
Choose based on how you sleep, your body weight and the feel you prefer.
Side sleepers often look for enough cushioning around the shoulders and hips, while back and front sleepers may prefer a steadier medium-firm or firm surface. Treat firmness ratings as a guide rather than a guarantee of comfort.
What type of super king size mattress is best for motion isolation?
Pocket sprung, hybrid and memory foam super king mattresses can all help reduce movement in different ways.
Individually wrapped springs respond separately to pressure, while foam comfort layers can absorb movement at the surface. Check the construction of the individual mattress before choosing.
Will a super king size mattress fit up my stairs?
It depends on the mattress and your home. Super king mattresses are large, so measure doorways, stairs, landings and tight corners before ordering, especially if the mattress is deep or delivered flat.
Rolled mattresses may be easier to manoeuvre, but you should still check the product delivery information before ordering.
Do I need a new bed frame for a super king mattress?
Not if your existing bed frame is the correct size and is still in good condition.
A UK super king mattress needs a suitable 180cm x 200cm base. Check that the frame or divan is supportive, level and compatible with the mattress you’re buying. If you’re using a slatted frame, follow the mattress manufacturer’s guidance on suitable slat spacing.
If your existing base needs replacing, browse our super king size beds and super king size divan beds.
Can I get next-day delivery on a super king size mattress?
Free next-day delivery is available on eligible in-stock Super King size mattresses across the UK mainland. Delivery timing depends on the individual mattress, your location and the options shown at checkout.
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