Sleeping Duck vs Koala vs Ausbeds: What Mattress Should You Buy For Life?

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Comparison table

Four things that set Ausbeds apart

1. Body-weight matched firmness

With the Sleeping Duck, you can choose soft, medium, firm, or extra firm foam inserts, but underneath it's the same very firm spring unit. The inserts change how the top feels, but your body still compresses the foam and hits those firm springs. Even on a medium insert, a Sleeping Duck feels comparable to our Cooper (Very Firm), which we'd recommend for people around 100kg and over. The Koala mattress is all foam and gives you two options: flip the foam layer for medium-firm or firm. 

At Ausbeds, we match the spring firmness to your body weight across 16 levels. A 60kg side sleeper and a 95kg back sleeper get completely different spring units, because that's the only way to get the right support for your body.

2. Every component is replaceable.

Most beds are sealed units. When the comfort layers wear out, you throw the whole thing away. With Ausbeds, every layer (springs, latex, micro springs, cover, felt) can be accessed, swapped, or replaced. No single component costs more than 25% of the mattress price. The foam in a Sleeping Duck mattress or Koala mattress will soften over time. With us, you replace that layer, not the whole bed.

3. Natural latex instead of polyurethane foam

The Sleeping Duck and Koala use polyurethane foam for their comfort layers. Ausbeds uses GOLS-certified organic natural latex, which lasts 3–4 times longer, sleeps cooler, and naturally resists dust mites. Foam mattresses start developing body impressions within 3–5 years. Latex bounces back.

The longest sleep trial in Australia (that we know of)

7 months. Over 210 nights. During that trial, we include two free component swaps. If the mattress feels too firm or too soft, we send you new springs or latex. We adjust the mattress to suit you, rather than making you return the whole thing. The Sleeping Duck offers 100 nights with free foam swaps. Koala offers 120 nights. Both are decent free trials, but neither lets you change the actual spring system.

What's inside each mattress (top to bottom)

Ausbeds Cloud (most plush):

• Tencel mattress cover (eucalyptus fibre, removable, washable)
• 5cm GOLS-certified natural latex (soft, medium, firm)
• 2 layers of micro springs (3200 springs in the queen)
• 2.5cm high-density foam
• 986 pocket springs (honeycomb layout, body-weight matched - soft, medium, firm, very firm)

Ausbeds Aurora (balanced plushness) – same as the Cloud except only one layer of micro springs for less cushioning. Ausbeds Cooper (firm surface) – same as the Cloud, however, it has no micro springs for a direct, firm surface.

Sleeping Duck Mach II:

• BreatheTech bamboo mattress cover (removable, washable)
• AntiGravity surface foam (polyurethane)
• ComponentAdapt foam inserts (swappable polyurethane layers: soft, medium, firm, extra firm)
• 768 pocket springs (straight row layout, firm tension)

Koala Mattress:

• TENCEL Lyocell mattress cover (not removable)
• Kloudcell comfort layer (flip it for medium-firm or firm)
• 3-zone support foam base
• No springs

Springs vs all-foam: why this matters long-term

This is where most mattresses in a box fall down after a few years, and it's worth understanding why.

In a foam mattress like the Koala, the foam does all the work: support and cushioning. There are no springs to share the load. Polyurethane foam compresses under body weight night after night, and over time, it doesn't bounce back. That's when you start sinking into a ditch in the middle of the bed. This is sagging, and it's the number one reason people replace their mattresses.

Spring mattresses distribute your weight across hundreds of individual pocket springs. Each coil responds independently, so the load is shared. The foam comfort layers on top still soften over time, but the springs underneath hold their shape for much longer. This is why hybrid mattresses and traditional pocket spring mattresses tend to outlast foam mattresses by years.

The Sleeping Duck mattress is a hybrid, with foam on top of pocket springs, so it has better long-term support than the Koala. But the foam inserts on the Sleeping Duck will still soften. When they do, you order new foam inserts or buy a new mattress. Likewise, with Ausbeds, you replace the worn latex layer and keep going. However, latex typically lasts 3-4x longer than polyfoam.

The Koala is an all-foam mattress. It can work well in the first year or two, especially for lighter sleepers. But all-foam beds have the highest failure rate compared to spring mattresses, because the foam does everything, and it wears out faster. When a Koala mattress starts sagging, there's nothing you can do. You buy a new mattress.

Firmness: one size doesn't fit all

The Sleeping Duck mattress comes in medium or firm, with soft and extra firm foam inserts available on request during the trial period. The default option for most buyers is medium firm. Those inserts change the comfort feel on top, but the springs underneath are always the same firm tension. For heavier sleepers (over 80kg), those firm springs work well. For lighter side sleepers, the Sleeping Duck can feel too firm regardless of which insert you choose. The springs push back against your shoulder and hip, and no amount of softer foam on top changes the foundation underneath.

The Koala mattress gives you two firmness options in one bed. Flip the comfort layer for medium-firm or firm. Simple and clever. But both sides are foam, and neither option accounts for your body weight. A 55kg person and a 100kg person sleeping on the same medium-firm Koala are getting very different experiences from the same mattress firmness.

At Ausbeds, we don't do generic "medium firm" as a label. We match spring tension to your body weight. If you weigh 65kg, you get softer springs. If you weigh 95kg, you get firmer springs. Within each level, you can adjust at home by repositioning the felt layer above or below the spring unit to go a bit softer or a bit firmer. It's the most reliable way to find the right mattress for your sleeping position and body. The best mattress for you is the one that feels neutral when you lie on it. Not obviously too hard, not obviously too soft.

Temperature regulation

All-foam mattresses sleep warmer than spring mattresses. That's physics: foam is dense, absorbs body heat, and doesn't have the airflow that springs provide. If you're a hot sleeper, this matters.

The Koala mattress uses Kloudcell foam, which is more open-cell than standard memory foam, so it's not the worst for heat. But it's still all-foam, and most beds made entirely of foam will trap more warmth than a hybrid or spring mattress.

The Sleeping Duck mattress runs a bit cooler because it has pocket springs underneath the foam. The bamboo cover also helps with breathability. But there's still over 10cm of polyurethane foam between you and those springs, which retains some heat.

Ausbeds mattresses have only 5cm of natural latex between you and the springs. Latex breathes better than polyurethane, and with springs underneath and a spring-based edge (rather than a foam box), air circulates through the whole mattress. Hot sleepers notice the difference, especially people switching from a foam mattress or memory foam bed.

Edge support and partner disturbance

Edge support: The Koala is the weakest here. All-foam edges will compress when you sit on the side of the bed. The Sleeping Duck has reinforced perimeter springs (2.3mm gauge) and a firm foam perimeter box, which gives it strong edge support, with the tradeoff being airflow. Ausbeds uses perimeter springs with a wire edge, which is firm and allows airflow through the sides.

Partner disturbance: The Koala actually wins this one. All-foam absorbs movement so well that your partner can toss and turn all night long without disturbing you. The Sleeping Duck mattress and Ausbeds both handle partner disturbance well (pocket springs isolate motion), but foam is hard to beat for pure motion absorption. If partner disturbance is your number one concern and nothing else matters, the Koala does this best.

Who should buy the Sleeping Duck?

The Sleeping Duck mattress is a solid hybrid bed at a fair price. Among mattress brands that sell direct, it offers decent foam adjustability and a medium firm starting point.

• You're over 80kg and want a very firm mattress. The firm spring tension in the Sleeping Duck suits heavier bodies well.
• You want a mattress in a box with free delivery anywhere in Australia. Order a mattress online, and it arrives at your door.
• You like the idea of swapping foam inserts to find your firmness. The Sleeping Duck Mach II offers soft, medium, firm, and extra firm inserts, and you can swap them for free during the 100-night trial, one of the better free trials among mattress-in-a-box brands.
• You want a washable mattress cover. The BreatheTech cover comes off and goes into the machine.

You might not like the Sleeping Duck if you're a lighter side sleeper (the springs may feel too firm), you want to change the spring tension (they're sealed in), or you want natural materials. The comfort layers are all polyurethane foam.

Who should buy the Koala?

The Koala mattress is a good entry-level bed and the cheapest option of the three if price is your main concern. It's the most affordable of these mattress brands and the simplest to buy online and set up.

• You're younger, lighter (under 70kg), and on a budget. The Koala can work well for this group. It feels comfortable from the first night.
• You share a bed, and partner disturbance is your top concern. The all-foam design absorbs movement better than any spring mattress.
• You want same-day delivery in a metro area. Koala can get a mattress to you in 4 hours, the fastest of any mattress in a box brand in Australia.
• You want to flip between two firmness levels at home. Unzip, flip the comfort layer to medium firm or firm, done.

You might not like the Koala mattress if you're heavier, you sleep hot, you want springs for long-term support, or you want a bed that lasts more than a few years without sagging. When the foam in a Koala starts to sink, there's no way to repair it. You chuck it and buy a new mattress.

Who should buy the Ausbeds Cooper, Aurora, or Cloud?

• You want a mattress you'll never have to throw away. Every layer is replaceable. When something wears out, you swap that part, not the bed.
• You want firmness matched to your body weight. Not an arbitrary "medium firm" label – a firmness matched to you specifically, so you sleep soundly all night long.
• You're a side sleeper who needs maximum pressure relief. The Aurora and Cloud use micro springs for comfort at the shoulder and hip.
• You want natural latex instead of polyurethane. GOLS-certified organic, naturally resistant to dust mites, breathes better, lasts longer. A latex mattress simply outlasts a foam mattress.
• You care about temperature regulation. Less foam, more springs, spring-based edges. Our beds run cooler than most beds using foam comfort layers.

You might not like Ausbeds if you need delivery outside Sydney, Melbourne, Brisbane, or Canberra (we charge $190+ for regional), you want the cheapest mattress possible, or you want same-day delivery out of a box. If any of those are a deal breaker, the Sleeping Duck or Koala might suit you better.

The bottom line

The Koala is a budget-friendly foam mattress that works for lighter people in the short-to-medium term. The Sleeping Duck is a solid hybrid at a mid-range price, among the better value hybrid mattresses if you don't mind a firm mattress. Ausbeds is a modular system built from premium materials, designed so you sleep soundly for years.

If you're in Sydney, come to our Marrickville showroom and try them. If you're interstate, call us on 02 8999 3333. We'll tell you what works for your body, and if one of the other brands genuinely suits you better, we'll say so.