Best King Size Mattress in Australia

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Australia is home to some of the best king-size mattresses in the world. Shoppers have many options at their disposal, but which one is the best? 

I've done all the hard work and selected three king mattresses based on customer satisfaction, price, and features.

So whether one is looking for a traditional bed, a memory foam option, or something in between, I have it covered. Let's get started!

A Quick Preview

Emma Diamond Hybrid Mattress
Best Overall – Editor’s Choice

Emma Diamond Hybrid Mattress
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Noa Mattress
Runner Up

Noa Mattress
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Ergoflex 5G Memory Foam Mattress
Best Orthopaedic Mattress

Ergoflex 5G Memory Foam Mattress
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Read more about this mattress

The Best King-Size Mattresses in Australia

Best Overall – Editor’s Choice — Emma Diamond Hybrid Mattress

Emma Diamond Hybrid Mattress

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  • An innovative pocket-spring layer that moves with the body of the sleeper;
  • The comfort layer conforms to body shape, a perfect design for excellent pressure relief;
  • The graphite foam cools the sleeper while allowing almost zero motion transfer .

The Emma Diamond Hybrid Mattress is my top pick for the best king-size mattress in Australia.

This award-winning mattress comes with top-class foam and springs to ensure excellent comfort and all-round support. But that's not all. Hot sleepers can count on the plush, breathable cover that helps keep one cool all night long. 

The Emma Diamond is one of the most versatile mattresses on the market. How so? It adjusts to the sleeper's favourite position while offering excellent temperature management. Consequently, it effortlessly identifies as the perfect choice for anyone looking for a top-of-the-line mattress.

It has a firmness suitable for almost everyone and a luxurious diamond quilted cover that will make one feel like a royalty. Plus, the mattress comes with a convenient delivery system that makes it easy to get set up.

Unlike the Noa Mattress, this one comes with machine washable covers - a unique selling point for parents living with kids or pets.

Anyone looking for a high-quality king-size mattress with exceptional cooling features can always count on the Emma Diamond. It will make the ideal buy.

Emma Mattress
Emma Mattress - 2

Runner Up — Noa Mattress

Noa Mattress

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  • Comes with sturdy side handles to make moving the mattress a breeze;
  • Gel particles dissipate heat to keep the sleeper cool;
  • Advanced construction for a longer lifespan compared to traditional innerspring mattresses.

Next up is the Noa mattress, another excellent choice for a king-size bed lover. 

This luxurious mattress flaunts high-quality materials and a generous gel-infused cooling memory foam layer. As a result, it adapts to body curves while offering excellent pressure-relieving benefits.

What's more? The high-density base ensures deep compression support while the whole structure is wrapped in a soft, sleep-inducing cover for added comfort.

The Canadian mattress designers ensured the Noa mattress accommodated all sleeping positions. This implies a shopper can be confident of a blissful night's rest whether they sleep on their back, side, or stomach.

The edge support on the Noa Mattress is superb. There'll never come a time one gets to feel the springs underneath the top of the mattress. 

In summary, anyone looking for one of the best king-size mattresses in Australia should consider the Noa mattress. It leaves the sleeper in a state of pure relaxation, ​refreshed and energized every single day.

Noa Mattress
Noa Mattress - 2

Best Orthopaedic Mattress — Ergoflex 5G Memory Foam Mattress

Ergoflex 5G Memory Foam Mattress

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  • An all-foam design, great for back pain sufferers and other orthopaedic issues;
  • Medium-firm feel, suitable for most sleepers;
  • A natural, removable Tencel cover ensures easy maintainers and optimal sleep health.

The Ergoflex 5G Memory Foam Mattress ticks all the boxes for those craving the benefits of an orthopaedic mattress. But that's not all; this luxury mattress hugs the body such that it provides excellent pressure relief - perfect for individuals with aching joints.

Those who love their mattress natural and free of synthetic materials will appreciate that the mattress cover is 100% natural Tencel - a sustainable and eco-friendly fabric. Also, this cozy cover ensures adequate temperature regulation and comfortable night rest. The result is like having a mattress that lets one sleep on a cloud!

Its beautiful aesthetics featuring grey and white tones immediately adds a sense of luxury to any sleeping environment. 

Top athletes understand the ergonomic benefits of memory foam. Hence they find the Ergoflex 5G Memory Foam mattress the right fit for enhancing injury prevention and recovery.

Ergoflex Mattress - 2
Ergoflex Mattress

Who Needs A King-size Mattress?

When it comes to the best king mattress, bigger is not always better. A king-size mattress may not be necessary for everyone. Smaller mattress options may be more suitable for smaller bedrooms or people who don't need much sleeping space.

However, a king-size mattress might be better if one shares a bed with a partner. It gives each person their own space to sleep without feeling cramped. It's also great for people who like to spread out when they sleep. Additionally, a king-size mattress can make a bedroom look bigger and more luxurious!

Also Read: How to store a mattress.

King Mattress Review: How To Choose A King-size Mattress

Shoppers on the hunt for a king-size mattress must consider some important factors. These include:

Sleeping Position

This is a crucial factor people consider when purchasing a king-size mattress or any mattress at all. 

Here is why:

Those who sleep on their sides will want a softer mattress to conform to their curves. On the other hand, back sleepers will want a firm mattress that offers less sinkage so that their spines remain aligned. The same applies to those who sleep on their stomachs.

Memory foam or latex mattresses can be good options for people who sleep on their back or side, while innerspring mattresses are better suited for those who sleep on their stomachs.

Looking for a top-quality memory foam mattress? Be sure to check out some like these.

Mattress Build Material

The mattress material remains one of the most important factors when making purchase decisions. The right material will result in a mattress that is comfortable and breathable. It should also be durable and long-lasting.

Bedroom Size

A king-size mattress will take up a lot of space, so one must ensure there is enough room for it. In the absence of ample real estate, other mattress sizes will make a more fitting choice.


King mattresses can be expensive. Hence, it is always smart to have a clear idea of the mattress one can afford. Also, the most expensive is not always the most comfortable or durable.

Having said that, this is one area where one can splurge if one enjoys comfortable and luxurious sleep every night.


What are the benefits of a king-size mattress?

A king-size mattress provides plenty of space for couples or individuals who like to spread out. It can also be a good choice for people who need extra room for pets or children.

What are the specs on a king-size mattress?

A king-size mattress is 76 inches wide and 80 inches long.

How long does a king-size mattress last?

A king-size mattress should last around 10 years. However, this will vary depending on the quality of the mattress and how often it is used.


A king mattress is often a proud addition to any bedroom, but making the best choice can be tough. Check out our top picks for the best king-size mattresses in Australia to help you decide on the perfect mattress for your sleeping space. 

However, if you're looking for a luxurious and comfortable sleeping experience, the Emma Diamond Hybrid Mattress effortlessly makes the cut. This mattress features a pocket-spring layer that moves as the sleeper's body moves. Its comfort layer highly conforms to the body's shape for excellent relief from pressure. Also, its graphite foam cools the body and prevents motion transfer. This is great for couples who don't want to interrupt each other's sleep as they move.

Start your journey today to quality sleep with the best king-size mattress in Australia.

Do you have questions or comments about king-size mattresses? We'd love to hear from you, so please comment below.

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