Give yourself more room to settle in with a TEMPUR® king size mattress. Explore the range and compare comfort options, prices and availability to find a mattress that suits your bed and the way you sleep.
Excellent delivery, lads in and out like a couple of ninjas! so far new mattress is really great, comfortable and lovely and softgreat quality all round cheers
Great price and amazing service, well informed, quick and efficient delivery and updates throughout. Very pleased!
Excellent service. Prompt and reliable. Great communication. The delivery driver called on the way to say how long they would be and delivered to my room as required.
So easy from the time I decided what I wanted. Ordering also so easy. On delivery, I paid for room of choice where the mattress was taken out, out on the bed and all packaging taken away, including my old mattress which I paid to be taken away.The mattress is amazing and so comfy!!
Really fast and efficient delivery! the delivery guys were brilliant and arrived earlier than expected which was great
Really happy with the mattress my son loves it. Delivery was smooth and brought it to my room of choice. Would recommend!
A great choice of mattresses and website was easy to use and follow. I paid for the mattress and used my blue light code. I also paid for old mattress removal and new mattress to be put into the bedroom. My delivery date and time was less than 24 hrs from purchase. My mattress is brilliant and I will be recommending them to my friends and family.
It was a very speedy, efficient transaction.We were very impressed with how clear and concise the transaction went, especially the updates on the progress of the order.The team who made the delivery were on time. And very pleasant . The mattress was well wrapped .And protected. All in all a good job.
Fantastically quick service! (delivered on sunday morning after order saturday afternoon)polite delivery staff!
Mattressnextday.Co.Uk was great. I did a lot of research since I was making a big purchase for our new home, but I found exactly what I wanted and it turned out to be even better once delivered.I didn't have to wait too long for delivery, and the team took everything straight to the rooms. No issues at all.
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This review represents a verified, genuine experience. To ensure a broad range of feedback, we include reviews from our community and shared insights from the manufacturer. While some reviewers may have received a promotional incentive, all feedback is collected via independent 3rd-party services to ensure integrity and honesty.
A TEMPUR® king size mattress gives you the generous proportions of a king size bed with a choice of TEMPUR® mattress options to compare. The extra width can be useful for couples who want more personal sleeping space, while a king size also works well in larger main bedrooms.
Browse by comfort preference, price and other available filters to make the range easier to compare and find an option that fits your sleep setup.
Choosing the right TEMPUR® king size mattress comes down to a few practical checks. Think about the space you have, the comfort you prefer and the details that matter most before comparing your options.
Start by checking that a king size mattress is right for your bed frame and bedroom. A standard UK king size mattress measures 150cm x 200cm, so measure your available space as well as your existing bed before ordering. Remember to leave enough room to move comfortably around the bed and access nearby furniture.
Next, think about the feel you prefer. Comfort is personal, particularly when two people share a bed, so compare the available firmness or comfort information carefully. Consider how your current mattress feels and whether you would prefer something softer, firmer or similar.
Firmness | Best suited to | What it feels like | What to choose |
Lighter and side sleepers | Plush with deeper cushioning | Choose for a softer, body-hugging feel | |
Side and combination sleepers | Cushioned with balanced support | A good all-round choice with noticeable contouring | |
Back and combination sleepers | Supportive with gentler contouring | Choose for a balanced, slightly firmer feel | |
Front sleepers and firmer-feel fans | Stable with less sink | Choose for closer support and less cushioning |
Next day delivery - Available on eligible in-stock mattresses across the UK mainland.
Shop with price confidence - Compare your tempur king size mattress options with our Lowest Price Promise.
We can take your old mattress away - Choose removal and we’ll collect your old mattress when your new one arrives.
Excellent reviews - See what verified customers have said before making your choice.
Award-winning retailer - Buy from a three-time NBF Online Bed Retailer of the Year.
British-designed quality - Explore British-designed mattresses made using carefully selected materials.
Tell us how you sleep, the comfort level you prefer and your budget. MattressFinder™ will help narrow down the options, making it easier to find a mattress that suits you. Find your perfect mattress.
TEMPUR® king size mattresses have a distinctive feel, so it is useful to understand how the material, comfort and available technologies differ before you choose. Looking beyond the basic specifications can help you decide whether the close-contouring TEMPUR® feel is right for you and your partner.
TEMPUR® Material shares some characteristics with standard memory foam, but it has its own distinctive construction and response. Developed from technology originally pioneered by NASA, the material uses billions of sensitive cells that adapt to your shape, weight and warmth, helping to distribute pressure as you settle into the mattress.
TEMPUR® Material is also designed to absorb movement. On a king size mattress, this can be particularly useful for couples, as movements such as turning over or getting out of bed are less likely to travel across the sleeping surface and disturb the other person.
TEMPUR® has a close, slow-response feel that gently contours around the body. If you prefer a springier mattress or like to feel more on top of the sleeping surface, this distinctive sensation may take some getting used to.
Some TEMPUR® ranges include SmartCool™ Technology within a removable cover. It is designed to feel cool to the touch and absorb excess body heat, which may suit sleepers who prefer a fresher-feeling surface. SmartCool™ is range-specific, so always check the individual product details to see which features are included.
TEMPUR® mattresses typically cost more than many entry-level foam or bed-in-a-box alternatives. When comparing value, consider the specialist material, motion absorption, comfort feel and manufacturer guarantee alongside the initial price. This gives you a clearer basis for deciding whether a TEMPUR® King Size mattress suits your priorities and budget.
Free next-day delivery to most locations - Need your new mattress quickly? Free next-day delivery is available across the UK mainland on eligible in-stock mattresses.
Free weekend delivery - If a weekend slot is available, you can choose it to make receiving your mattress easier to fit around your plans.
Choose a delivery date - Select your preferred available delivery date at checkout, helping you plan around work, moving day or replacing your current mattress.
Just £39 to responsibly dispose of your old mattress - Add our removal service at checkout and we’ll collect your old mattress when your new mattress is delivered, saving you from arranging disposal separately.
100% of your mattress is reused and recycled - Your old mattress is separated into its core components so the raw materials can be repurposed. This means 100% of the mattress is reused and recycled rather than sent to landfill.
A greener way to get rid of your old mattress - Skip the hassle of organising mattress disposal yourself with a convenient recycling service designed to make delivery day easier.
Explore the latest MattressNextDay sale to compare great-value offers across trusted brands, popular mattress sizes and a range of comfort grades. Shop mattress sale.
Choosing a mattress is easier when you know what to compare. Our product experts answer common questions about TEMPUR® king size mattresses, including size, guarantees, suitability, and different comfort feels.
Martin Seeley, Product Expert at MattressNextDay, answers questions about TEMPUR® king size mattresses.
A standard UK king mattress measures 150cm x 200cm, making it a practical choice for couples who want more room than a double.
A Euro king is slightly wider at 160cm x 200cm. That extra 10cm can make a difference when matching your mattress to the bed base, so it is important to check the exact measurements before ordering.
King size mattresses are a popular choice for couples because their extra width gives each person more sleeping space than a standard double. When choosing between TEMPUR® king size mattress options, consider both sleepers’ comfort preferences and compare the available firmness information before buying.
If your bed frame is designed for a standard UK king size mattress measuring 150cm x 200cm, it should accommodate a mattress of the same stated dimensions. It is still worth checking the individual product measurements and the internal dimensions of your bed frame before ordering.
Check the mattress dimensions, depth, comfort information, price and delivery availability. It is also useful to measure the route into your bedroom, including doorways, stairs and tight corners, so you can plan ahead for delivery.
TEMPUR® mattresses are available in a range of comfort feels, including Soft, Medium, Medium Firm and Firm, although the exact choices vary by collection and retailer. Softer options offer more cushioning and contouring, while firmer options generally provide a more supportive feel with less sink. Think about what you like or dislike about your current mattress and use that as a starting point when comparing the available options.
That will depend on your body weight, preferred firmness and how much contouring feels comfortable to you. Some lighter front sleepers may prefer a surface that feels easier to move on and offers less sink. Because comfort is personal, compare the available firmness options and individual product details rather than assuming one feel will suit every sleeping position.
TEMPUR® Material is designed to absorb movement across the mattress. This can be particularly useful on a king size bed, where two people have more room to sleep but may still notice each other moving. When one person turns over or gets out of bed, the material can help limit how much of that movement travels across to the other side.
TEMPUR® mattresses sold by MattressNextDay include a 10-year manufacturer guarantee, subject to the relevant terms and conditions. When comparing mattresses at different price points, it can be useful to consider the guarantee alongside the materials, comfort feel and overall service rather than looking at the upfront cost alone.
Some TEMPUR® mattresses feature SmartCool™ Technology within a removable cover. It is designed to feel cool to the touch and absorb excess body heat, which may appeal if you prefer a fresher-feeling sleep surface. SmartCool™ is only available on selected ranges, so check the individual product specification to see whether it is included.
If you and your partner prefer noticeably different comfort feels, check the available TEMPUR® mattress and bed configurations carefully. Firmness options and compatible setups can vary between ranges, so it is best to review the individual product details rather than assuming every king size mattress can be configured differently on each side.
*Delivery charges may apply for some areas. Please see our delivery page for more information.
1. Order by 6pm for next day delivery between Monday-Friday, 12pm on Saturday and 3pm on Sunday. The 'Order by' time may be subject to change dependant on our delivery partners.
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