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Short answer: The Sleeping Duck Mach II is worth considering if you and a partner need different firmness levels, or if you are unsure which feel will suit you and want the ability to change it at home. Its replaceable foam system, strong edge support and 100-night guarantee make it more adaptable than a conventional mattress-in-a-box. The trade-offs are a tall, heavy build, possible initial odour, and a returns process that reviewers say is not always clear. Australian list prices currently run from AU$999 for a Single to AU$2,699 for a Super King, with a Queen at AU$1,649 (Sleeping Duck Australia, accessed 2026).
What is the Sleeping Duck Mach II?
The Mach II is an Australian hybrid mattress-in-a-box combining a pocket-spring core with multiple foam layers. Its defining feature is not simply the choice of Medium or Firm at checkout: the foam comfort components can be changed after delivery, and larger mattresses can be ordered with different firmness on each side.
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The Tool Desk
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What makes the design different?
Most bed-in-a-box mattresses lock you into the feel you selected until you replace the entire mattress. Mach II uses interchangeable firmness foam, so a comfort change does not require buying another spring unit. Tom’s Guide reports several firmness configurations and half-half arrangements, although some less common combinations require contacting customer service.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
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How much does the Mach II cost in Australia?
These are Sleeping Duck Australia’s listed prices when accessed in 2026. They are not a temporary sale quote, and the storefront can change prices or availability.
| Size | Listed price (AUD) | Typical use |
|---|---|---|
| Single | AU$999 | One sleeper |
| King Single | AU$1,099 | One adult with extra width |
| Double | AU$1,349 | Compact two-person room |
| Queen | AU$1,649 | Common couple size |
| King | AU$1,999 | More personal space for two |
| Super King | AU$2,699 | Maximum width |
Medium, Firm and Half-half selections appear on the Australian product page. Half-half is most relevant to couples who prefer different feels; confirm the exact combinations available for your size before ordering, because the manufacturer says some options are arranged through customer service.
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How does the adjustable firmness system work?
You select a starting configuration, then use the in-home guarantee to request a different firmness if the first choice is not right. The change is intended to replace the relevant comfort foam rather than make you purchase a second complete mattress.
- Choose your initial feel. Select Medium, Firm or an available Half-half layout for your size.
- Sleep on it long enough to judge it. Sleeping Duck’s FAQ asks customers to try each firmness for 21 nights before requesting another change.
- Request an adjustment. During the 100 Night Guarantee, firmness adjustments are included, according to the official FAQ.
- Use the return route if it still does not work. A return and refund can be arranged within the guarantee period, subject to the stated limit of two mattresses per household.
The 21-night guidance matters because a new mattress can feel unfamiliar at first. It also prevents changing settings repeatedly before your body has had time to adapt. Ask customer service to confirm the available replacement configuration for your exact size before you place an order.
What are the Mach II’s specifications?
| Specification | What is established | Qualification |
|---|---|---|
| Type | Hybrid mattress-in-a-box | Pocket springs combined with foam and polyester |
| Height | 31 cm listed; 32.5 cm tested | Sleeping Duck listing versus CHOICE Queen measurement |
| Layers | 15 | CHOICE specification |
| Spring density | 256 springs per square metre | CHOICE specification |
| CHOICE test weight | 50 kg | Queen test setup; not a mattress weight rating |
| Firmness choices | Medium, Firm and Half-half selections | Some configurations may require customer-service assistance |
| Warranty | 10 years | Reported by Tom’s Guide and Bedbuyer; check current terms and base requirements |
| Trial | 100 Night Guarantee | Official FAQ includes firmness adjustments and a two-mattress-per-household return limit |
The 50 kg figure in the CHOICE entry describes its Queen test weight, not how much the mattress weighs and not a recommended sleeper limit. The sources supplied for this review do not state the Mach II’s shipping or unpacked weight, so plan for a two-person setup rather than relying on an unverified number.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
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- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Is the Mach II comfortable for side sleepers?
It can be, provided you select enough pressure relief at the shoulder and hip. The ability to change the foam is useful for side sleepers whose first setting feels too hard, but the mattress does not guarantee a single ideal setting for every body shape.
For predominantly side sleepers
Start with the softer available configuration if your shoulders or hips usually feel compressed on firm beds. Give it the recommended 21 nights before changing it. If your pelvis sinks too far or your lower back feels unsupported, move toward a firmer configuration instead of judging the mattress solely by its first-night feel.
For back and stomach sleepers
Back and stomach sleepers generally need stable support around the midsection. The Mach II’s pocket-spring core and firmer option provide a route to that feel, while the adjustment system lets you reduce pressure if the surface becomes uncomfortable. Your body position and weight distribution matter more than the label Medium or Firm, so use the trial rather than assuming the name predicts comfort.
Is the Mach II good for couples?
Couples are among the clearest use cases. A Half-half layout can give each person a different firmness on larger sizes, reducing the compromise required with a single-feel mattress.
Edge support is another strength repeatedly noted by reviewers, which helps couples use the full width and makes sitting on the edge easier. Motion isolation is less conclusive: Tom’s Guide and Bedbuyer describe generally capable support but note that movement can still be felt by a light sleeper. If one partner wakes easily, pay attention to that limitation during the home trial rather than assuming hybrid springs will eliminate transfer.
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- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
How does it perform for support and edge stability?
The Mach II’s support profile comes from its pocket-spring unit and foam comfort layers. Reviews consistently identify body support and edge support as strengths, making it a reasonable choice for sleepers who dislike the collapsing edge of some all-foam beds.
- Support: The spring core provides a resilient base, while the interchangeable foam changes how deeply you settle into it.
- Edge support: Reviewers report a stable perimeter, useful when getting in and out or sharing a smaller size.
- Customisation: Changing the foam can address a pressure or firmness mismatch without discarding the whole mattress.
- Limits: No supplied source gives independent numeric support or comfort scores, and CHOICE’s score fields are member-only. Treat qualitative reviews as observations, not laboratory ratings.
Does the Mach II sleep hot or smell after unboxing?
Expect a possible new-mattress smell immediately after opening. Tom’s Guide reports off-gassing after unboxing; that is an observation, not a guarantee that every owner will experience the same intensity or duration.
Temperature performance is similarly individual. The hybrid construction allows airflow through springs, but the foam surface, room temperature, bedding and sleeper can all affect heat. Unpack it in a ventilated room, leave space around the mattress, and use the trial to decide whether its temperature is acceptable for you. Do not cover a strong odour with bedding before the room has aired.
What are the practical setup issues?
The Mach II is tall and substantial. The 31 cm listed height (32.5 cm in CHOICE’s Queen measurement) can make fitted-sheet changes and getting into bed harder, especially on a high base.
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- Measure the bedroom route, including stairs, corners and door clearances.
- Check the combined height of your base and a 31-to-32.5 cm mattress so the finished bed is comfortable to enter.
- Arrange a second person for moving and unboxing; the supplied sources do not publish a confirmed unpacked weight.
- Have clean sheets ready, but leave the room ventilated while the mattress expands and airs out.
After opening
- Place the boxed mattress on the final base before cutting the outer packaging.
- Unroll it flat and remove the inner plastic without using a blade against the fabric.
- Allow it to expand according to the manufacturer’s current instructions and ventilate the room.
- Record the delivery date and your chosen configuration so the 100-night period and any firmness request can be discussed accurately with support.
What is included in the 100-night guarantee?
Sleeping Duck’s official FAQ says the 100 Night Guarantee includes free firmness adjustments. It asks you to try each firmness for 21 nights before another change and says a return and refund can be arranged within the period, with a limit of two mattresses per household.
Rank #4
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Those terms are more useful than a short showroom test because you can evaluate the mattress in your own room and bedding. They are not a promise that every logistical detail is effortless: Bedbuyer and Tom’s Guide mention ambiguity around returns. Before ordering, ask who collects the mattress, whether packaging is needed, and how the two-mattress limit is applied to your household.
What warranty does Sleeping Duck provide?
Tom’s Guide and Bedbuyer list a 10-year warranty. The available material does not establish every exclusion, inspection requirement or bed-base rule, so read the current warranty document before purchase and keep your invoice.
In particular, verify the approved base type, ventilation requirements, treatment of stains or damage, and whether different foam configurations affect a claim. A 10-year headline is useful only when the eligibility conditions match your setup.
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What are the main advantages and disadvantages?
| Advantages | Disadvantages and cautions |
|---|---|
| Firmness can be changed after delivery | Tall profile can complicate sheets and bed height |
| Half-half options suit couples with different preferences | Substantial mattress; setup may require two people |
| Strong support and edge stability in reviews | Possible off-gassing smell after unboxing |
| 100-night home guarantee with free adjustments | Returns have been described as ambiguous by reviewers |
| 10-year warranty reported by reviewers | Motion isolation is not perfect for every light sleeper |
| Multiple foam configurations | Some configurations require contacting customer service |
Who should buy the Mach II?
Choose it if adjustable firmness is more important to you than having the lightest or lowest-profile mattress. It is particularly compelling for couples with different comfort preferences, people who have struggled to choose a firmness online, and shoppers who value a long in-home evaluation.
Be cautious if you need to move the mattress frequently, have a very high bed already, are highly sensitive to new-product odours, or want a returns process with every collection detail published upfront. A conventional fixed-feel mattress may be simpler when both sleepers already agree on firmness.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
How does it compare with another mattress?
Do not compare only the advertised firmness label or spring count. Use the following decision axes and ask both manufacturers for like-for-like terms.
| Decision axis | What to check on the Mach II | Why it matters |
|---|---|---|
| Firmness adjustability | Medium, Firm and Half-half; post-delivery foam changes | Determines whether comfort can be corrected without replacing the mattress |
| Couple compatibility | Split-side availability for your size | Prevents one sleeper compromising on feel |
| Support and edges | Pocket-spring core and reviewer observations | Affects sitting, getting up and usable sleep surface |
| Motion isolation | Real-world response during the trial | Important to light sleepers sharing a bed |
| Temperature and odour | Foam feel, ventilation and initial smell | Determines whether the bed suits warm sleepers and sensitive noses |
| Height and handling | 31 cm listed; 32.5 cm Queen test | Changes bed height, sheet fit and moving difficulty |
| Returns | 100 nights, 21-night adjustment guidance and two-mattress limit | Sets the practical cost of getting the choice wrong |
| Warranty | Reported 10 years; verify current conditions | Coverage depends on the base and exclusions |
| Total price | Use the delivered Australian price for your size | Adjustability is valuable only if it fits your budget |
Where can you buy the Mach II in Australia?
The listed sizes and configurations are available through Sleeping Duck’s Australian storefront. Prices and options are current as accessed in 2026, so confirm the final delivered total, stock status, delivery area and any active promotion at checkout. The mattress is not a generic model with identical terms across countries; the prices and guarantee described here are for the Australian offering.
Sleeping Duck Mach II verdict
The Mach II’s strongest reason to exist is the ability to change the foam feel after purchase. That feature, combined with a 100-night guarantee and split firmness for couples, addresses the biggest uncertainty in online mattress buying. Support and edge stability are also consistent positives in published reviews.
Its compromises are physical and procedural: a tall, heavy mattress is harder to handle, a new-foam smell is possible, movement may still disturb a light sleeper, and return logistics deserve clarification before payment. For Australian buyers who prioritise customisation and a long home trial, the Mach II is a strong shortlist candidate at the current AU$999-to-AU$2,699 range. For buyers who want a low bed, minimal setup effort or completely explicit returns, choose more cautiously.
Frequently Asked Questions
Does the 100-night period start on delivery day?
The official FAQ confirms a 100 Night Guarantee but the supplied terms do not specify every start-date rule. Ask Sleeping Duck to confirm whether the clock begins at delivery, unboxing or another event, and save that answer with your order records.
Can I order a Half-half Mach II in every size?
Half-half is offered on larger sizes, while the exact combinations depend on the configuration shown for your mattress. If the option is not visible online, contact customer service before ordering rather than assuming a split side can be added later.
Are replacement foam components sold separately after the trial?
The available product information confirms firmness adjustments during the guarantee but does not establish a permanent replacement-parts store or price list. Ask the manufacturer about post-trial foam availability, compatibility and shipping before relying on the system for long-term changes.
What should I do if the mattress is still uncomfortable after two settings?
Document which firmness you tried and for how many nights, then contact support before the guarantee expires. The stated household limit is two mattresses, so clarify whether your requested change counts as an adjustment or a replacement under the current terms.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
