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Sleep Republic
Australia's Most Awarded Mattress
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Sleep Republic
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Super King Mattress in a Box

Luxurious comfort gets supersized with our biggest mattress ever

Super King size mattress dimensions

Mattress size: 203 X 203 X 31 cm

Pocket spring count: 2500

Price: $1,799

Why choose a Super King mattress?

Designed with enhanced back support and a whopping 2,500 pocket springs, our newest mattress, the Super King, helps promote a truly restorative sleep with its unique, multi-layered, hybrid design.


Our super king-size coil system provides even support across the entire surface of the mattress, giving you excellent spinal alignment and relief from pressure points in the shoulders, neck, hips and knees.


Whatever your preferred sleeping position, be it back, side or stomach, you’ll wake refreshed and well-rested. Specially designed layers mould to your personal body shape, ensuring that the spine remains neutral at all times. This promotes a feeling of full-body relaxation while providing specific support to the problem areas that can affect taller or heavier sleepers. A super king mattress lets you experience a better night’s sleep every night of the year.

Free delivery

As long as you’re located within the range of our partnered delivery companies, we can get your double size hybrid mattress in a box to you within a few days. We’ve worked for years to find the best delivery companies to deliver to locations all over Australia.

Award-winning mattress

BedBuyer, Australia’s largest online bedding review company, has awarded our mattress the best mattress in a box out of 100 products tested and reviewed. And we’ve won that award 3 years in a row!

150 Night Guarantee

If you don’t love your new king pocket spring mattress within 150 nights of purchase, you can return it — no questions asked. That’s our guarantee to you.

CertiPUR-US® certified foam

We use foam which has been manufactured ethically. It’s made without ozone depleters, toxic chemicals, or flame retardants. It also has low Volatile Organic Compound (VOC) emissions, so you can rest easy knowing the king foam mattress you’re using is environmentally friendly.

Awarded #1 Overall Mattress in a Box out of hundreds of products tested.

Frequently Asked Questions

How big are super king mattresses compared to kings?
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Our hybrid pocket spring king-sized mattress is 183 x 203 x 31cm compared with our super king size, which is 203 X 203 X 31cm, so you’ll get considerably more width and space in our newest size to really stretch out and relax.

How much does a super king mattress weigh?

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Super king mattresses are one of the largest on the market, measuring 203 X 203 X 31cm. As a result, they can weigh quite a bit. The average super king mattress weighs between 60-80kg. However, some heavier models can weigh up to 100kg. When considering a new mattress, it’s important to take weight into account. Heavier mattresses can be tough to move around and may require additional support. It’s best to have two people help set up your new super king mattress, which weighs around 60kg.

Is a super king mattress worth it?

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If you’ve decided your king pocket spring mattress isn’t the right fit for you, we donate the mattress to one of our partnered charities. We never sell used mattresses, but the charities will often sell them on through their op shop outlets.

If I return my mattress, where does it go?
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If you’ve decided your super king mattress isn’t the right fit for you, we donate the mattress to one of our partnered charities. We never sell used mattresses, but the charities will often sell them on through their op shop outlets.

How do I care for my super king mattress?

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We highly recommend using a mattress protector to keep your mattress fresh and clean and protect the sleeper from any allergens within the mattress. To keep your mattress in the best performing condition possible, rotate your mattress from top to bottom every few months. Any small spillages can be wiped with a damp cloth and left to dry before remaking the bed.

How do I unpack my super king mattress?
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When you receive your new super king, you’ll also receive a welcoming pack with instructions and an opening tool. First, you’ll need to remove the outer blue wrapper with the cutting tool provided, making sure you don’t puncture the mattress. Then, place the mattress on your super king bed base. Next, cut open the bag and watch your mattress unroll. Be careful to step back as the mattress can unfurl quickly. You’ll then have to wait a few hours until your new mattress has completely puffed up to its original size.

Do you offer same-day delivery of your super king mattresses?
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Yes! We offer same-day delivery for most major cities as long as you’ve made your purchase before midday. Most locations can expect delivery to take between 7 and 14 business days. In regional and remote locations, delivery can take up to 21 days.

How do I care for my super king mattress?
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Yes! You’ll spend one-third of your life sleeping, so why not make that time as restful, restorative and relaxing as possible? Our luxurious hybrid pocket spring mattresses are great for people who suffer from bad backs or regularly wake with aches and pains. We’ve developed our award-winning mattress with specially designed, premium-quality layers that provide unparalleled support and comfort, making our super king mattress perfect for taller or heavier sleepers. If you’re looking to upgrade from your queen, then the super king mattress is the way to go.