King Size Mattresses

Discover our king-size mattresses showcasing a variety of well-loved brands. You'll find Silentnight's innovative Miracoil spring system, TEMPUR's high-quality memory foam, Sealy's Posturepedic technology, TheraPur's orthopaedic support with eco-friendly materials, and many more.

What do you need from a king mattress?

Too hot and can't sleep, or do you wake up with aches and pains? Finding the right mattress can help you get a well-rested night without the hassle. Our mattresses can help with:

• Pressure relief: King-size memory foam mattresses allow that 'sink-in' feeling which contours to your body, provides excellent support and relives pressure points throughout the night.
• Sleep disturbances: If you or a partner are easily woken up by movement, a king pocket-sprung mattress is ideal. These mattresses reduce motion transfer and provide great support with individually wrapped springs that move as you sleep.
• Temperature regulation: If you get too hot or cold at night, latex mattresses or gel mattresses contain a cooling layer to control your body temperature while offering foam-like comfort and durability. Discover tips to cool down at night if you need more support.
• Allergies: Natural mattresses are made from wool and cotton, providing breathable, allergy-free nights with added eco-friendly benefits.
• Various comforts: Perfect if you can't decide on support levels, hybrid mattresses combine memory foam with pocket springs. Or choose a zip and link mattress and combine two smaller sizes to make a king mattress.
• Budget: Traditional spring mattresses provide the support and comfort you need at great value.

For more information, check out our mattress type guide. If you aren't sure, you can always pop into your local Dreams store to try out our mattresses in person.

Which king-size mattress is best for my sleeping position?

Selecting a king-size mattress that aligns with your sleeping position can enhance sleep quality and comfort at night.

Side sleepers should consider a soft king-size mattress for essential support. If you move during the night, a medium firmness mattress with memory foam fillings will quickly mould to your body shape.

If you prefer sleeping on your front or need the best mattress for sleeping on your back, a firm or very firm king mattress helps distribute your body weight better. A spring king sized mattress would be best, helping to provide the extra support you need for your spine plus additional comfort.

To find the mattress of your dreams, take our Sleepmatch quiz today.

How big is a king-size mattress?

A king-size mattress fits a king-size bed, which is 5 feet wide and 6 feet 6 inches long. These mattresses are great for extra space when sleeping. If you're worried about how you'll get it up the stairs, don't worry. While our standard free delivery is to your doorstep, you can select our chargeable Room Of Choice delivery service, and we'll handle the heavy lifting for you.

What if the king mattress isn't right for me?

We want to ensure you find the best option, so we offer a 100-night Comfort Guarantee once you choose your mattress. This guarantee allows you to swap your mattress for another after 30-100 nights of use if you aren't happy (T&Cs apply).

What do I do with my old mattress?

If you have an old mattress you'd like to part ways with, choose our recycling service when checking out. We'll take your old mattress off your hands while we deliver your new one. Nothing goes to landfill, so you can be sure you're doing your bit to reduce waste.