Buying Guides — Sizing
A super king mattress is the biggest standard bed size sold in Australia, and the extra width and length change more than the floor plan of your bedroom. Below we look at what the science of sleep actually says about space, movement and shared beds, and how that plays out on our super king mattress range.
Physical comfort and better sleep
Physical comfort is the foundation of restorative rest, and it starts with having enough room to move. A super king mattress gives you significantly more surface area than a queen or king, so you can shift between sleeping positions through the night without running out of space. That freedom of movement helps the body stay properly supported, which reduces the aches and stiffness that come from sleeping cramped into an awkward position.
Reduced sleep disturbance for couples
Sharing a bed often means sharing every toss, turn and alarm. The extra width of a super king mattress puts real distance between two sleepers, so one partner's movement is far less likely to travel across the mattress and wake the other. Less motion transfer means fewer interruptions and a more continuous night's sleep for both people.
Stress reduction and psychological comfort
Sleep isn't purely physical — feeling cramped or boxed in can raise stress levels and make it harder to switch off at night. A wider, longer mattress creates a sense of space that many sleepers find calming, particularly if you're used to feeling restricted on a smaller bed. Lower stress at bedtime supports a deeper, more genuinely restful sleep.
Airflow and sleep temperature
Temperature regulation matters for sleep quality, and a bigger mattress surface can help. With more space between bodies and better airflow across the bed, heat is less likely to build up under the covers. That's a real advantage if you or your partner tend to sleep hot.
Why couples sleep better on a super king
For couples, the benefits go beyond simply having more room. Each partner can settle into their preferred sleeping position without encroaching on the other's space, which takes a surprising amount of friction out of sharing a bed — and it's a lot easier to feel close to someone when you're not also fighting them for room.
Space and sleep hygiene
A larger mattress also makes it easier to keep your sleep environment clean and organised — there's more room to change and air the bedding properly, and less overlap and clutter around the edges of the bed. A tidy, well-ventilated sleep space is a small but genuine contributor to better rest.
Choosing your firmness
Size and firmness are two separate decisions. Firmness is set by the spring wire gauge and comfort-layer density in a mattress build, not by the size or the construction type — so a super king is available in the same range of firmness levels as our smaller sizes, from Soft & Plush through to Extra Firm. As a rough guide: side sleepers usually suit Soft & Plush, back sleepers and combination sleepers or couples usually suit Medium Firm, and stomach sleepers usually suit Firm. If you and your partner have different preferences, our showroom team can talk you through builds that work well for couples with mismatched needs.
FAQs
Is a super king mattress worth it if I sleep alone?
Yes — solo sleepers benefit from the extra room to move and stretch out just as much as couples do. If your bedroom has the floor space, there's no rule that says a super king is only for two people.
Does a bigger mattress mean a firmer mattress?
No. Size and firmness are independent — firmness comes down to the spring wire gauge and comfort-layer density used in the build, so a super king is available across the same firmness tiers as any other size.
Will a super king mattress reduce disturbance from my partner moving?
It helps considerably. The extra distance between sleepers on a super king reduces motion transfer, so movement on one side is less likely to be felt — or to wake you — on the other.
What size room do I need for a super king mattress?
Super king is the largest standard mattress size sold in Australia, so it needs the most floor space of any size in our range. See our mattress sizes guide for the exact dimensions before you measure up your room.
How is a super king different from a king mattress?
A super king is wider and longer than a king, giving each sleeper noticeably more personal space. Read our full King vs Super King comparison for a side-by-side look at the two sizes.
Shop the range
Browse our super king mattresses across every firmness, or compare against king size if you're still deciding.