Looking for a mattress that doesn’t swallow you whole? Firm mattresses provide exceptional spinal support for back pain sufferers, stomach sleepers, and those who simply prefer a solid sleep surface. We’ve tested and reviewed Australia’s best firm mattresses, from ultra-dense foam to supportive hybrids, with Onebed’s innovative adjustable design leading our recommendations.
Please note: While firm mattresses can provide excellent support, always consult with a healthcare provider if you experience ongoing discomfort or require specialised orthopaedic support.
Quick Picks: Australia’s Best Firm Mattresses
- Onebed X – Best Adjustable Firm Mattress in Australia
- Sleep Firm Mattress – Best Extra-Firm Feel in a Box
- Ecosa Mattress – Best Foam Mattress with Adjustable Firmness
- Ergoflex 5G – Best Orthopaedic Memory Foam Option
1. Onebed X 12” – Best Adjustable Firm Mattress in Australia
The Onebed X takes our top spot with its innovative hybrid design that lets you customise firmness at home—perfect for those who want firm support without committing to a single feel.
Specs:
- Type: Hybrid (Dunlop latex, memory foam, pocket springs)
- Firmness Level: 7-8/10 (adjustable)
- Adjustable: Yes (swappable layers)
- Trial Period: 125 nights
- Warranty: 15 years
- Price: AUD $1,300 (currently on sale for just $650)
- Rating: 4.8/5 from ProductReview.com.au
Pros:
- Customisable firmness by rearranging foam layers at home
- Excellent edge support for full mattress use
- Minimal partner disturbance despite responsive feel
- Superior cooling compared to all-foam firm mattresses
- Australian-designed with premium materials
Cons:
- Higher price point than some competitors (though justified by the hybrid build)
- Heavier to rotate due to spring core (though this also improves durability)
Detailed Review: The Onebed X combines the best of both worlds—the responsive support of pocket springs with the pressure relief of premium foams. What sets it apart is the ability to adjust firmness by rearranging the comfort layers, making it ideal for sleepers who want firm support but occasionally need a softer feel. The 5-zone pocket spring system provides targeted support for your lower back while maintaining proper spinal alignment—crucial for back and stomach sleepers.
2. Sleep Firm Mattress – Best Extra-Firm Feel in a Box
For those who want the firmest possible mattress without compromise, the Sleep Firm delivers an unyielding sleep surface that still manages to provide pressure relief.
Specs:
- Type: Hybrid (High-density foam, micro-coils)
- Firmness Level: 9/10 (extra firm)
- Adjustable: No
- Trial Period: 150 nights
- Warranty: 10 years
- Price: AUD $949
- Rating: 4.5/5 from ProductReview.com.au
Pros:
- Ultra-firm feel ideal for those who find most “firm” mattresses too soft
- Excellent for heavier sleepers (100kg+)
- Minimal sinkage for easy movement
- Budget-friendly price point
- Extended trial period
Cons:
- Too firm for side sleepers and lighter individuals
- Limited pressure relief compared to other options
Detailed Review: The Sleep Firm mattress lives up to its name with a truly rigid sleep surface that’s perfect for sleepers who need maximum support. The high-density foam layers resist compression even under significant weight, making it ideal for heavier Australians who find other mattresses sag too quickly. While it’s definitely not for everyone, those seeking the firmest mattress in Australia will appreciate its unwavering support and minimal break-in period.
3. Ecosa Mattress – Best Foam Mattress with Adjustable Firmness
The Ecosa offers a unique adjustable all-foam design that can be configured from medium-firm to very firm, making it versatile for different preferences.
Specs:
- Type: All-foam (Memory foam, ergonomic support foam)
- Firmness Level: 6-8/10 (adjustable)
- Adjustable: Yes (flippable layers)
- Trial Period: 100 nights
- Warranty: 15 years
- Price: AUD $800
- Rating: 4.8/5 on their website
Pros:
- Three firmness options in one mattress (medium, medium-firm, firm)
- Excellent motion isolation for couples
- Waterproof inner cover
- Good pressure relief despite firmness
- Minimal off-gassing compared to other foam mattresses
Cons:
- Edge support not as strong as hybrid options
- Can sleep warm for some users
Detailed Review: The Ecosa stands out among all-foam mattresses with its innovative layer design that allows you to adjust firmness by rearranging the internal foam layers. In its firmest configuration, it provides excellent support for back and stomach sleepers while still offering the pressure-relieving benefits of memory foam. The waterproof inner cover is a practical bonus for Australian households (especially if you’ve got kids or pets), while the minimal motion transfer makes it ideal for couples with different sleep schedules.
4. Ergoflex 5G – Best Orthopaedic Memory Foam Option
The Ergoflex 5G offers hospital-grade pressure relief combined with firm support, making it ideal for those with specific orthopaedic needs.
Specs:
- Type: All-foam (High-density memory foam)
- Firmness Level: 8/10 (firm)
- Adjustable: No
- Trial Period: 30 nights
- Warranty: 10 years
- Price: AUD $900
- Rating: 4.8/5 from Productreview.com.au
Pros:
- Medical-grade foam for orthopaedic support
- Excellent pressure relief despite firm feel
- Minimal motion transfer
- Naturally antimicrobial cover
- Proven durability (maintains firmness over years)
Cons:
- Shorter trial period than competitors
- Initial adjustment period can be challenging
- Can sleep warm in Australian summers
Detailed Review: The Ergoflex 5G uses high-density memory foam similar to those found in hospital settings, providing exceptional pressure relief while maintaining a firm, supportive feel. It’s particularly well-suited to sleepers with specific back issues who need consistent support throughout the night. While the 30-night trial is shorter than competitors, the mattress has proven durability with many users reporting it maintains its firmness level for years—a common concern with memory foam mattresses in Australia’s varied climate.
Comparison Table: Best Firm Mattresses in Australia
Comparison Table: Best Firm Mattresses in Australia
| Product Name | Type | Firmness | Price (Queen) | Trial | Rating | Best For |
|---|---|---|---|---|---|---|
| Onebed X | Hybrid | 7–8/10 | $1,300 | 125 nights | 4.8 | Adjustable Firmness + Hybrid Feel |
| Sleep Firm Mattress | Hybrid | 9/10 | $949 | 150 nights | 4.5 | Budget Ultra-Firm Support |
| Ecosa Mattress | Foam | 6–8/10 | $800 | 100 nights | 4.8 | Adjustable All-Foam Firmness |
| Ergoflex 5G | Foam | 8/10 | $900 | 30 nights | 4.8 | Orthopaedic Memory Foam Support |
Buying Guide: Finding the Best Firm Mattress in Australia
Why Firmness Matters
A firm mattress promotes proper spinal alignment by preventing excessive sinking, particularly important for back and stomach sleepers. The right firmness level can reduce morning stiffness and help maintain healthy posture throughout the night.
And if you’ve ever woken up with a sore back after sleeping on a too-soft mattress at a mate’s place, you’ll understand why firmness is crucial for many Aussies!
Who Benefits Most from Firm Mattresses?
- Back and stomach sleepers need a flat, supportive surface
- Heavier individuals (over 90kg) require additional support to prevent sinking
- Those with lower back pain often find relief with proper spinal alignment
- Hot sleepers typically experience better airflow on firmer surfaces
Foam vs. Hybrid Firm Mattresses
Hybrid mattresses like the Onebed X combine supportive coils with comfort foam layers, offering:
- Better airflow (important in Australia’s warmer regions)
- More responsive feel for easy movement
- Superior edge support
- Typically longer lifespan
All-foam firm mattresses like the Ecosa provide:
- Superior motion isolation for light sleepers
- Consistent support across the entire surface
- Often lower price points
- Easier delivery and setup
The Onebed X Advantage
What makes the Onebed X our top recommendation is its unique adjustability. By simply unzipping the cover and rearranging the internal layers, you can fine-tune the firmness to your exact preference. This is particularly valuable if:
- You’re not 100% sure which firmness level is right for you
- Your firmness preferences change seasonally
- You and your partner have different support needs
- Your body’s needs change over time (pregnancy, weight changes, injuries)
With a 125-night trial, you have plenty of time to experiment with different configurations in the comfort of your own home.
Our Selection Criteria
When compiling this list of the best firm mattresses in Australia, we focused on:
- Verified firmness levels (7-9 range on a 10-point scale)
- Customer ratings of 4.2 stars and above from verified sources
- Adjustability options where available
- Value for money considering materials and construction
- Trial periods and warranties that protect your investment
- Australian availability with reasonable shipping times
Frequently Asked Questions
What is the firmest mattress available in Australia?
The Sleep Firm Mattress offers the most rigid sleep surface among our recommendations, with a 9/10 firmness rating. For those seeking maximum firmness, this is typically the best option without moving to specialized orthopaedic models.
Are firm mattresses better for back pain?
Firm mattresses can help alleviate back pain by promoting proper spinal alignment, particularly for back and stomach sleepers. However, the ideal firmness depends on your specific condition, body weight, and sleeping position. Some back pain sufferers actually benefit from medium-firm rather than extra-firm surfaces.
Who should sleep on a firm mattress?
Firm mattresses are generally best for:
- Back and stomach sleepers
- Heavier individuals (90kg+)
- Those who prefer sleeping “on” rather than “in” their mattress
- People who need additional support for lower back issues
- Hot sleepers who want maximum airflow
Can I make my current mattress firmer?
Yes, several options exist:
- Add a firm mattress topper (though this is sometimes counterintuitive)
- Place a plywood board between your mattress and foundation
- Lower your room temperature (foam mattresses firm up in cooler environments)
- Rotate or flip your mattress (if it’s designed to be flippable)
However, if your mattress is sagging or more than 7-8 years old, these solutions are temporary at best.
What’s the difference between firm and extra-firm?
Firm mattresses (7-8/10) provide solid support while still offering some cushioning in the top layers. Extra-firm mattresses (9-10/10) have minimal cushioning and feel very rigid, with little to no “give” when you lie down. Most sleepers find true extra-firm mattresses too hard for comfortable sleep, but they can be beneficial for those with specific support needs or significantly higher body weight.
Conclusion: Finding Your Perfect Firm Mattress
The best firm mattress in Australia balances solid support with just enough comfort to prevent pressure points. The Onebed X stands out with its innovative adjustable design that lets you fine-tune firmness at home—perfect for those who want firm support without committing to a single feel.
For those who prefer all-foam density, memory foam pressure relief, or an ultra-firm surface, our other recommendations deliver excellent performance and value. With generous trial periods (especially Onebed’s 125-night risk-free trial), you can test your chosen mattress in real-world conditions before committing.
Remember that firmness preference is highly personal, and the “best” firm mattress is ultimately the one that gives you consistent, pain-free sleep night after night.
