Why Choose a Super King Mattress?
A super king size mattress is not just about size, it’s about sleep quality. In the UK, the standard super king measures 180cm wide, that’s a full 30cm wider than a standard king size mattress.
Maximum Space for Couples: A super king provides each sleeper with 3ft of personal space (the equivalent of a single bed each), significantly reducing "roll-together" and motion transfer.
Perfect for Tall Sleepers: At 6ft 6in (200cm) long, it is a popular choice for taller individuals who find their feet hanging off a standard double
The Family Hub: Ideal for Sunday mornings when the kids or pets decide to join you for a cuddle.
Finding the Best Super King Mattress for Your Sleep Style
Choosing the right material is vital for a mattress of this size. Our Sleep Experts recommend selecting a type based on your specific comfort needs:
Super King Pocket Sprung Mattresses: Feature individual springs that react independently to your body weight. This is the gold standard for couples, as movement on one side is less likely to disturb the person on the other side.
Super King Memory Foam Mattresses: These mattresses mould to your unique body shape, offering cushioning support across the body for joints and a "weightless" feel.
Super King Hybrid Mattresses: The best of both worlds. Hybrids combine a supportive spring base with a top layer of foam, gel, or latex for tailored comfort.
Super King Orthopaedic Mattresses: Specifically designed with a firmer feel to support a more balanced sleeping position and provide a firmer feel.
Expert Advice: Which Firmness Do You Need?
As industry leaders with over 30,000+ Trustpilot reviews, we know that firmness is subjective. However, our Mattress Firmness Guide suggests the following:
Side Sleepers: Usually prefer a Soft to Medium mattress feel to allow shoulders and hips to sink in.
Back Sleepers: Typically benefit from a Medium-Firm support level for lumbar stability.
Front Sleepers: Often require a Firm or Extra Firm surface to prevent the hips from dipping.
Trusted by Experts, Proven by Awards
Since 2003, MattressNextDay has been a trusted voice in British sleep. Our commitment to quality is why we carry a wide range of Which? Best Buy winners, products independently tested for durability and performance.
We don't just sell mattresses, we also provide expertise. Our brand ambassadors from the world’s leading manufacturers work closely with us to provide expert advice and guidance across our entire range, ensuring you find a bed that suits your comfort preferences. We are also proud 3 x time winners of the NBF's 'Online Bed Retailer of the Year' award.
What size is a super king mattress?
In the UK, a super king mattress is 6ft x 6ft 6in (180cm x 200cm). For a full comparison of all dimensions, see our Ultimate UK Bed and Mattress Size Guide.
Do I need to buy a new bed frame?
Not necessarily. You can use your existing frame as long as it is a 6ft Super King size and is in good structural condition. However, there are two vital things to check to protect your mattress warranty:
Support: If your current base is sagging or has broken slats, it will cause your new mattress to dip, which often voids the manufacturer's warranty.
Slat Gaps: If you have a slatted base, ensure the gaps between the slats are no wider than 75mm (3in). Gaps wider than this can cause the mattress fillings to bulge and settle unevenly.
If your old base has seen better days, we offer a huge range of Super King Divan Bases designed to provide the perfect foundation.
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