King Size Mattresses
A king size mattress measures 5 feet wide and 6 feet 6 inches long, making it our second largest mattress size available. Available in a variety of styles with different fillings to choose from, you can pick between classic options such as traditional springs to more advanced materials such as memory foam and more.
At 5 feet wide and 6 feet 6 inches long, king size mattresses are our second largest mattress. They offer plenty of space for couples and are available with a range of mattress fillings and comfort grades. No matter your budget, the luxury of a 5ft mattress is not beyond your reach.
What types of king size mattresses are there?
We have a wide range of affordable and high-quality king size mattresses available; each type has its own benefits:
Memory foam
A king size memory foam mattress features advanced technology designed to maximise your sleep experience. The mattress will soften and respond to you and your sleeping position. This makes these mattresses great for keeping you comfortable all night long.
Pocket spring
If you often overheat during the night, then a king sized pocket sprung mattress may be for you. This temperature-regulating mattress is perfect for couples, allowing airflow through the mattress to keep you cool all night long. With each independent spring, the mattress responds perfectly to your sleeping position and movement, evenly distributing your bodyweight and your partner's too.
Traditional spring
A traditional spring mattress is usually the most affordable king size mattress, making them great for those on a budget. However, this doesn't mean they lack quality. With hand-tufted and edge-to-edge support, they provide excellent back alignment, perfect for those who need extra spinal support.
Zip and link
With a zip and link mattress you can have varied technologies and comfort levels within one design. This makes them a popular choice for couples. For example, if your partner is fond of a firm mattress but you prefer something softer, a zip and link mattress could be an ideal solution as you both get to sleep on what you want.
Which king size mattress is best for me?
Identifying which king mattress is best depends on a number of things. Think about your sleeping position, the support you need and your budget to find your perfect mattress.
For instance, if you sleep on your side, you probably need a mattress with plenty of cushioning. Look for medium or soft comfort grade, as these allow you to sink slightly into the mattress whilst still supporting your spine.
For those who sleep on their front or back a 5ft mattress in a firmer grade could be a more suitable choice. These provide increased support for your spine and joints from the pressure that can build up from sleeping in these positions.
Choosing a king size mattress is an important investment - one that's going to last for years. That's why we want to make sure you get the very best. Our 100-Night Sleep Guarantee gives you the option to swap your mattress for another after sleeping on it for up to 100 nights (Ts & Cs apply).
If you're still unsure which king size mattress is best for you, check out our guide to mattress types.