Sleeping Duck Mach 2 vs Ausbeds Cooper. Which One Is Right For You?

The Ausbeds Cooper is our equivalent to the Sleeping Duck Mach II. Both are hybrid mattresses – foam (or latex) on top of pocket springs. Both give you a responsive, "sleeping on top" feel. The reason you'd choose the Ausbeds Cooper over the Sleeping Duck mattress comes down to three things:

1. body-weight matched springs
2. natural latex, and
3. a modular system where every component is replaceable for life.

The reason you'd choose the Sleeping Duck Mach II is price, nationwide free delivery, and a simple, interchangeable firmness system.

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Having slept on both mattresses, here's what I think

I bought a Koala first. Sent it back – way too hot. It's all foam, feels spongy, and my body didn't like it. Then I got a Sleeping Duck. The Sleeping Duck mattress feels genuinely similar to the Cooper – you're sleeping "on" top rather than "in" the mattress.

The three things I didn't love about the Sleeping Duck Mach II:

1. Springs much firmer than expected. The Sleeping Duck Mach II uses the same very firm springs regardless of which inserts you choose. The medium version simply has a slightly lighter density on top – underneath, the springs are identical to the firm version. The feeling is the same: your body weight crushes the comfort layer against those firm springs. For back sleepers and stomach sleepers over 80kg, that's fine. But for side sleepers, I could feel those springs pushing back against my shoulder and hip. The medium firm label is a bit misleading – this is a firm mattress across all sleep positions.
2. Slightly warmer than the Cooper. Not hot – but still closed-cell polyurethane foam. The Cooper definitely runs cooler, with 5cm of natural latex and high-density foam. Less heat retention. If you're a hot sleeper like I am, this may matter to you.
3. Lack of full modularity. On my Ausbeds mattress, I started on the Aurora, went to the Cloud, and ended up on the Cooper. I love the directness. If I ever want to go softer, I can add microspring layers. With the Sleeping Duck Mach II, you can swap the foam inserts, but the springs are sealed. You can't change the spring tension if your weight changes. Sleeping Duck offers foam swaps, but that's where the adjustability ends.

Who should buy the Sleeping Duck Mach II?

The Sleeping Duck mattress is a solid mattress. There's a reason it has strong reviews across thousands of buyers. Here's who it suits:

• You're over 80kg. The springs in the Sleeping Duck Mach II work well for heavier people. At that body weight, you compress through the comfort layers enough that the springs provide good support. Back sleepers and stomach sleepers in this range do especially well with the Sleeping Duck.

• You like a firm to rock-hard mattress. The Sleeping Duck Mach II firmness options range from medium firm to extra firm. Even the medium version has firm springs underneath. If you prefer a firm mattress – solid support under every part of your body – the Sleeping Duck Mach II delivers that. The extra firm version is about as hard as a mattress gets.

• Edge support matters to you. The Sleeping Duck Mach II has reinforced perimeter support using a hard foam box around the perimeter springs. Edge support on the Sleeping Duck Mach II is excellent. There's a trade-off: that hard box restricts airflow through the mattress.

• Partner disturbance is a concern. The comfort layers in the Sleeping Duck mattress absorb movement well – they dampen energy rather than transferring it. Motion transfer on the Sleeping Duck Mach II is low, good for couples. If you and your partner have different firmness preferences, the half-and-half option lets you choose different inserts on each side.

• You want the convenience of a mattress-in-a-box with fast delivery. The Sleeping Duck mattress arrives vacuum sealed in a box, with free delivery Australia-wide.

You might not like the Sleeping Duck Mach II if you're under 80kg (the firm springs will feel too hard), you're a side sleeper who needs pressure relief, or you want to change the springs later. One mattress spring configuration is all you get – only the inserts can change.

Who should buy the Ausbeds Cooper?

• You want springs matched to your body weight. You choose the right pocket springs for your weight. A 60kg person and a 100kg person get completely different spring units. The Sleeping Duck Mach II gives everyone the same springs regardless of weight.

• You want a buy-for-life mattress. Every component in the Cooper can be replaced individually – springs, latex and cover. No single component costs more than 25% of the mattress price. When the latex eventually needs replacing, you buy a new latex layer, not a new mattress.

• You want to add micro springs later. Start with the Cooper and add micro spring layers later. The Cooper becomes an Aurora ($500 for one microspring layer) or a Cloud ($500 for a second). We do the swap in your bedroom. Nothing goes to waste.

• You prefer natural materials. The Cooper includes the same GOLS-certified organic latex found on all our models. 5cm of natural latex on top – responsive and bouncy, not the slow sinking of foam. Latex is naturally dust mite resistant, sleeps cooler, and lasts 3–4 times longer. This is one of the biggest material differences between the Sleeping Duck mattress and the Cooper.

• You're a hot sleeper. Less material between you and the springs means less heat retention. Natural latex breathes better than polyurethane. If you run warm at night, the Cooper runs noticeably cooler than the Sleeping Duck Mach II.

You might not like the Cooper if you're after the cheapest mattress ($300 more than the Sleeping Duck), or you need Australia-wide delivery (right now, we only deliver to Sydney, Melbourne, Brisbane and Canberra). The Cooper has a firm, direct feel. If you need deep pressure relief for side sleeping across different sleep positions, consider the Aurora or Cloud mattress instead.

Comparison table

Key differences explained

Body-weight matched springs vs one spring tension

The Sleeping Duck Mach II uses the same spring tension for everyone. The tempered steel springs in the Sleeping Duck mattress are the same whether you weigh 55kg or 110kg. The firmness adjustment happens only through swapping the inserts on top. If the springs in the mattress are too firm for your weight, no amount of soft cushioning will fix the support.

At Ausbeds, we match the spring tension to your body weight. Up to 50kg gets you soft springs. Between 50kg and 90kg gets you medium springs, and over that, you get firm springs. Within each firmness, there are adjustments you can make at home. The spring unit has a soft and a firm side. Move the felt layer above or below the spring unit to make it softer or firmer.

The Sleeping Duck Mach II springs are very firm. Combined with the comfort layers, you get a firm to extra-firm feel. But the underlying sensation is the same – your body compresses through the polyurethane until it hits those firm springs. For side sleepers and older people, this can mean hip pain and pressure on the shoulder.

Latex vs polyurethane

The Sleeping Duck Mach II uses polyurethane for its upper layers (the "antigravity surface foam" and the "ComponentAdapt" inserts). These foam layers soften over time and typically show body impressions within 3–5 years. This is true of most other mattresses that use polyurethane comfort layers.

The Cooper mattress uses GOLS-certified organic latex. Latex bounces back rather than slowly compressing. It lasts 3-4x longer than polyfoam. It also breathes better, meaning less heat retention.

Full modularity vs insert-only swaps

Sleeping Duck Mach II: You can swap the inserts for a different firmness – the extra firm version, medium firm version, medium version, or soft version. Sleeping Duck offers free foam swaps during the 100-night trial. After the trial, replacement inserts are available for purchase. The spring system is sealed. This is a limitation shared by most boxed mattresses and other mattresses in this price range.

Ausbeds Cooper: The springs, latex, cover, felt, and foam layer inside the mattress are all accessible and replaceable. If a part wears out, you don't have to throw away the whole mattress.

What's inside each mattress?

Sleeping Duck Mach II: Four layers. The BreatheTech cover is a removable cover made from bamboo fabric. The antigravity surface foam sits underneath. The ComponentAdapt firmness system comes in soft, medium firm, firm, and extra firm. If you and your partner have different firmness preferences, you can choose different inserts on each side (queen-size mattress or larger). The Mach II uses 768 pocket springs with independently reinforced perimeter support and perimeter springs for edge support. The Sleeping Duck mattress is 31cm in height and arrives vacuum sealed.

Ausbeds Cooper: A Tencel cover (eucalyptus-based). 5cm of GOLS-certified organic latex – the same natural latex found on our Aurora and Cloud. A high-density foam layer (~2.5cm). 986 honeycomb pocket springs calibrated to your body weight on our firmness scale. A high-quality mattress built to order in Sydney, using high-quality materials.

The bottom line

While the Sleeping Duck Mach II is $300 cheaper, the Ausbeds Cooper gets you body-weight matched springs, organic latex that lasts 3–4 times longer than foam, a 7-month trial, and the ability to replace every component. You won't throw this mattress out in 3-5 years. New partner, weight change, bad back – we swap the parts, not the whole bed.

The Sleeping Duck Mach II is still a good mattress. If you're over 80kg, want a firm mattress, or need Australia-wide delivery, it does the job well. But the springs are one-size-fits-all, the comfort layers are all polyurethane, and once the trial period ends, your adjustment options are limited.

I work at Ausbeds, so take my view with that context. But I slept on the Sleeping Duck Mach II for a year, and I'm being straight with you. If you're in Sydney, come to our Marrickville showroom. Try the Cooper, the Aurora, the Cloud. If the Sleeping Duck genuinely suits your sleep positions and body weight better, we'll tell you.

- Alex