Finding the right mattress when you’re carrying extra weight can feel like an impossible task. That sinking feeling when you lie down, the premature sagging, the overheating at night—these are all too familiar struggles for Australians weighing over 100kg. But a good night’s sleep shouldn’t be exclusive to lighter sleepers.
As someone who’s researched extensively in the sleep industry and personally tested Onebed’s range, I’ve compiled this guide to help plus-size Australians find mattresses that offer proper support, durability, and comfort. Each recommendation has been evaluated based on weight capacity, support systems, cooling properties, and long-term durability.
Disclaimer: While this guide provides informed recommendations based on specifications, your personal comfort preferences and body needs are unique. We strongly encourage consulting with a healthcare professional if you have specific back or joint concerns, as proper support is especially crucial for heavier individuals. What works for one person may not work for another.
Quick View: Best Mattresses for Heavy People
| Mattress | Best For | Price (Starts at) | Trial | Warranty |
|---|---|---|---|---|
| Onebed X 12” | Overall Support & Cooling | ~$650 (discounted option) | 125 nights | 15 years |
| Big Fig | Maximum Weight Support | ~$2,366+ | 120 nights | 20 years |
| Yinahla Posture Gel | Luxury Spinal Support | ~$3,127 | 100 nights | 20 years |
| Sleeping Duck Mach II | Customisable Firmness | ~$1,599 | 100 nights | 10 years |
| Sleep Republic | Value Hybrid | ~$799 | 150 nights | 12 years |
| Peace Lily Latex | Natural Materials | ~$1,599 | 100 nights | 25 years |
| Sleep Firm | Ultra-Firm Support | ~$949 | 100 nights | 15 years |
Note: Prices are subject to change and promotions. Please check the manufacturer’s website for current pricing.
1. Onebed X 12’’ – Best Hybrid Mattress for Heavy Sleepers up to 120kg
- Type: Hybrid (5-zone pocket springs + multiple foam layers)
- Firmness: Medium-firm (balanced support for heavier users)
- Price: Starts at $1300 — now just $650 for a limited time!
- Reviews: 4.8 stars out of 517 on ProductReview
Why It’s Great for Heavy People
The Onebed X is engineered specifically with heavier sleepers in mind, combining robust support with pressure-relieving comfort. The 5-zoned pocket spring system is the star feature here—providing reinforced support where you need it most (particularly in the lumbar region) while offering gentler cushioning at the shoulders and legs.
What makes this mattress stand out for plus-size sleepers is the thoughtful layering system above the springs. The combination of gel-infused memory foam, charcoal-infused foam, and proprietary Davina® foam creates a sleep surface that contours to your body without that dreaded “sinking in quicksand” feeling that many heavier folks experience on standard mattresses.
Edge support is exceptional thanks to the foam encasement around the coil system, meaning you can use the entire surface of the mattress without feeling like you might roll off—a common complaint among heavier sleepers. While Onebed doesn’t specify an exact weight limit, users weighing between 100-130kg will find the mattress comfortable.
The cooling technologies incorporated throughout the mattress address another crucial concern for heavier sleepers—temperature regulation. The gel-infused memory foam and breathable cover work together to dissipate body heat, helping you stay cool throughout the night.
Pros:
- Zoned support system targets different body areas appropriately
- Excellent edge support prevents roll-off sensation
- Multiple cooling technologies prevent overheating
- Balanced medium-firm feel suits most sleep positions for heavier bodies
- Outstanding value compared to similar premium hybrids
- Australian-designed with 125-night trial period
Cons:
- May feel too firm for strict side sleepers under 90kg
- Heavier than some all-foam alternatives (though this indicates quality materials)
- Not designed for extremely heavy people (e.g., 150+ kg per person), individuals significantly over 120 kg may want to consider a mattress with a verified limit.
2. Big Fig Mattress – Best U.S. Engineered Mattress for Heavy People
- Type: Hybrid (tufted foam + high-resilience coils)
- Firmness: Medium
- Price: Varies by size (starts at $2366)
- Reviews: 4.6 stars out of 348 on Ubuy
Why It’s Great for Heavy People
The Big Fig mattress is one of the few beds on the market specifically designed from the ground up for larger bodies. With an impressive weight capacity of up to 500kg (1,100 lbs), it’s built to provide unwavering support for even the heaviest sleepers.
What sets the Big Fig apart is its purpose-built construction, featuring a robust 1,600-count pocket coil system paired with multiple layers of high-density foams that resist compression. The plush, quilted top is treated with ThermoGel cooling technology that activates with body heat, while a gel-infused perforated foam layer underneath enhances airflow, helping to actively cool the body for a more comfortable sleeping experience.
Temperature regulation—a critical concern for plus-size sleepers—is further supported by the ThermoGel cooling system. The reinforced edge support system ensures you can use the entire mattress surface without compression or sagging at the perimeter.
While Big Fig is an American brand, Australian shoppers can now access this specialized mattress through Ubuy Australia, making it a viable option for those who prioritize maximum weight capacity and durability above all else. (Note: The Big Fig Foundation and Bed Frame are sold separately.)
While Big Fig is an American brand, Australian shoppers can now access this specialized mattress through Ubuy Australia, making it a viable option for those who prioritize maximum weight capacity and durability above all else.
Pros:
- Purpose-built for larger bodies with exceptional 500kg weight capacity
- ThermoGel cooling technology combined with gel-infused perforated foam for enhanced airflow
- Reinforced edge support system for maximum mattress usability
- 20-year warranty, including free repairs and replacements
- 120-night trial for peace of mind
Cons:
- Higher price point plus potential import costs
- Returns may be more complicated than with Australian-based brands
- Firm feel may not suit those who prefer a plusher surface
Note: As an imported product, shipping times and return processes may differ from local brands. Consider these factors when making your decision.
3. Yinahla Posture Gel – Best Luxury Innerspring Hybrid
- Type: Innerspring hybrid (ultra coil + Posture Gel™)
- Firmness: Medium-firm (luxury firm feel)
- Price: Starts at $3,127 (Single)
- Reviews: 4.8 stars out of 65 reviews on ProductReview
Why It’s Great for Heavy People
The Australian-made Yinahla Posture Gel represents the premium end of the market for heavier sleepers seeking exceptional quality and long-term durability. Its sophisticated 9-zone Ultra-Coil system (featuring over 1,900 springs in a queen size, reinforced with titanium) creates a responsive surface that minimizes sagging—one of the most common complaints among plus-size sleepers.
What makes this mattress particularly suitable for heavier individuals is the medical-grade Posture Gel™ layer, which provides targeted pressure relief while maintaining proper spinal alignment.
This gel layer also promotes airflow through its open-cell structure, addressing the common issue of overheating that many heavier sleepers face.
The reinforced foam edge encasement ensures you can comfortably use the entire mattress surface without experiencing the dreaded “roll-off” sensation.
While the price point is undeniably premium, the Yinahla offers award-winning durability that may provide better value over time compared to replacing less robust mattresses every few years.
Another advantage: the mattress features single-sided, no-turn technology, meaning you don’t have to worry about flipping or rotating it regularly.
Pros:
- Medical-grade Posture Gel™ layer with a 9-zone titanium-reinforced coil system
- Exceptional edge support and minimal sagging over time
- Superior temperature regulation through advanced gel ventilation
- Australian-made with premium, locally sourced materials
- 20-year warranty reflects strong confidence in durability
- Single-sided design — no flipping or rotating required
Cons:
- Premium price point compared to other options
- Medium-firm feel may not suit those seeking a plush surface
- Heavy mattress, which may require assistance during initial setup
4. Sleeping Duck Mach II – Best Customisable Hybrid for Couples
- Type: Hybrid (high-density modular foam + multi-zoned pocket springs)
- Firmness: Fully customisable – Medium, Firm, or dual-side
- Price: Starts at $1,599 (Single)
- Reviews: No individual review of the product. Brand reputation is 4.8 out of 5 from over 5,540 reviews.
Why It’s Great for Heavy People
The Sleeping Duck Mach II offers a unique solution for heavier sleepers seeking long-lasting support and customisation.
Built with a high-density AirGrown™ polyurethane foam comfort layer and a twice-tempered multi-zoned steel spring system, it provides reliable support that resists sagging, even under heavier weight.
What makes this mattress particularly valuable for heavier individuals is its adjustable modular design.
During the 100-night trial period, you can swap the foam layers to fine-tune the firmness, ensuring the right balance of support and comfort — a critical factor for plus-size sleepers who often find standard mattresses either too soft or too hard.
The BreatheTech™ bamboo cover enhances airflow and temperature regulation, helping address the common issue of overheating.
Meanwhile, the reinforced perimeter support allows you to comfortably use the entire mattress surface without the risk of roll-off, increasing usable space by up to 20%.
For couples where one or both partners are heavier, the dual-firmness option is especially useful, allowing each side of the bed to be independently customized to individual needs.
Pros:
- Modular design allows firmness adjustments after purchase
- Dual-firmness option ideal for couples with different support needs
- Strong motion isolation reduces partner disturbance
- Bamboo cover enhances cooling and breathability
- Twice-tempered steel springs provide durable body support
- Australian-designed with local customer service
Cons:
- Premium price point compared to some competitors
- Modular foam system may create a slight “seam” feeling between zones
- No official weight limit published by the brand
5. Sleep Republic Mattress – Best High Spring-Count Hybrid
- Type: Hybrid (natural latex + gel memory foam + pocket springs)
- Firmness: Medium-firm
- Price: Starts at $799
- Reviews: 4.8 stars out of 1909 reviews on ProductReview
Why It’s Great for Heavy People
The Sleep Republic mattress offers exceptional value for heavier sleepers, combining a high spring count (up to 2,500 coils) with a design built to provide strong, consistent support. This impressive coil system delivers the robust structure that plus-size individuals need without sacrificing comfort.
What makes this mattress stand out for heavier sleepers is the thoughtful combination of materials. The gel-infused memory foam contours to your body for pressure relief, while the natural latex layer promotes airflow and adds responsive bounce—preventing the “stuck” feeling that many heavier people experience with pure memory foam mattresses. This balanced approach creates a sleep surface that contours to your body without excessive sinking.
The edges are reinforced with higher-tensile steel springs, ensuring that heavier individuals can use the entire mattress surface without feeling like they might roll off—a common complaint among plus-size sleepers. The medium-firm feel strikes a good balance that works for various sleeping positions, making it versatile for different body types.
For heavier Australians seeking a quality hybrid at a mid-range price point, the Sleep Republic offers exceptional value without compromising on the features that matter most for proper support.
Pros:
- High coil count (up to 2,500 springs) provides excellent support
- Gel-infused memory foam helps regulate temperature and relieve pressure
- Natural latex enhances breathability and adds responsive bounce
- Dynamic edge support prevents roll-off
- Excellent value for the construction quality
- Generous 150-night trial period
Cons:
- Edge support and long-term durability may decrease if close to the upper weight limit over time
- Single firmness option may not suit all preferences
- Some users report it sleeps slightly warmer than expected
6. Peacelily Latex Mattress – Best Flippable Natural Latex Mattress
- Type: All-natural Dunlop latex (flippable: Medium/Firm)
- Firmness: Medium on one side, Firm on the other
- Price: ~$1,599 (queen)
- Reviews: 4.9 stars out of 356 Reviews on the official website
Why It’s Great for Heavy People
The Peace Lily Latex Mattress offers a compelling natural alternative for heavier sleepers, built entirely from solid Dunlop latex—a material known for its outstanding durability and resistance to body impressions, a common issue for plus-size sleepers.
The flippable design is particularly valuable for heavier individuals who may not be sure which firmness level will work best. The medium side provides a balance of comfort and support, while the firm side offers more robust support that many heavier back and stomach sleepers prefer.
This versatility allows you to experiment with both options during the 100-night trial.
Natural latex excels at temperature regulation—a significant benefit for heavier sleepers who tend to sleep hot.
The material’s inherent breathability and open-cell structure promote airflow, helping to dissipate body heat and maintain a cooler sleep surface throughout the night.
For environmentally-conscious heavier sleepers, the Peace Lily offers the added benefit of being made from sustainable, organic materials without synthetic foams, chemical adhesives, or flame retardants.
The impressive 25-year warranty reflects the exceptional durability of natural latex, which typically outlasts conventional foam mattresses.
Pros:
- Solid latex core provides strong support and no-sag performance
- Flippable design offers two firmness options in one mattress
- Natural latex provides exceptional durability and resilience
- Excellent temperature regulation for hot sleepers
- Free from synthetic foams and harmful chemicals
- Impressive 25-year warranty
- Sustainable and eco-friendly materials
Cons:
- Heavier and more difficult to flip compared to foam mattresses
- Higher price point than some synthetic mattress options
- Natural latex has a distinctive feel that may take some adjustment
For heavier sleepers seeking a natural, chemical-free sleep surface with exceptional durability, the Peace Lily represents an excellent investment in long-term sleep quality.
7. Sleep Firm Mattress – Best Ultra-Firm Mattress-in-a-Box
- Type: Pocket spring with high-density foam top
- Firmness: Very firm (9/10 firmness rating)
- Price: Starts at $949 (Single)
- Reviews: 4.9 stars out of 209 reviews on ProductReview
Why It’s Great for Heavy People
The Sleep Firm Mattress lives up to its name, offering one of the firmest sleep surfaces available in Australia’s mattress-in-a-box market. With its super high spring count and Boomerang™ high-density eco foam, it’s engineered to provide exceptional support for heavier individuals who need a solid, stable sleep foundation.
What makes this mattress particularly suitable for plus-size sleepers is its S+ Pro 5-zone spring system combined with Boomerang™ high-density foam.
This construction creates a sleep surface with minimal give—ideal for heavier back and stomach sleepers who require maximum support to maintain proper spinal alignment throughout the night.
The ultra-firm design directly addresses one of the most common complaints among heavier sleepers: excessive sinking and spinal misalignment.
By offering a sturdier sleep surface, the Sleep Firm Mattress helps promote better posture and may reduce the risk of waking up with aches and pains.
Additionally, the breathable construction promotes airflow, helping regulate temperature—an important consideration for heavier individuals who tend to sleep hot.
While the very firm feel won’t suit everyone, it fills an important niche for those who find most mattresses too soft for their needs.
Pros:
- Ultra-firm support ideal for heavier back and stomach sleepers
- S+ Pro 5-zone spring system targets support where needed
- High-density Boomerang™ foam maintains firmness over time
- Breathable design helps regulate temperature
- Australian-made with local customer service
- Excellent value for robust construction
Cons:
- Too firm for most side sleepers
- Limited pressure relief compared to softer options
- Minimal contouring
Buying Guide: How to Choose a Mattress When You’re Heavier
Finding the right mattress as a plus-size sleeper involves considering several critical factors beyond what average-weight shoppers might prioritize. Here’s what you need to focus on:
Weight Capacity
Why it matters: Standard mattresses often aren’t designed to support weights over 100-120kg per person long-term.
What to look for:
- For individual sleepers over 100kg: Minimum 150kg individual capacity
- For couples where one or both are heavier: Combined capacity of 250-300kg+
- Heavy couples (both over 120kg): Consider specialized options with 400kg+ capacity
Support Core Construction
Why it matters: Heavier bodies put more pressure on mattresses, causing premature sagging in inadequately constructed models.
What to look for:
- Hybrid designs with pocket coils (at least 1,000 in a queen) provide the best support foundation
- Coil gauge matters—look for 12-15 gauge coils (lower numbers indicate thicker, stronger coils)
- Zoned support systems that provide extra reinforcement in the hip and midsection areas
- High-density base foams (1.8+ pcf) if choosing an all-foam mattress
The Onebed X’s 5-zone pocket spring system exemplifies ideal support construction for heavier sleepers, while the Yinahla’s 9-zone system offers premium targeted support.
Mattress Thickness
Why it matters: Thinner mattresses compress too much under heavier weights, causing “bottoming out.”
What to look for:
- Minimum 25-30cm (10-12″) total height for sleepers over 100kg
- 30-35cm (12-14″) ideal for those over 120kg
- Look for substantial comfort layers (at least 5-7cm) above the support core
Most mattresses in our list meet these thickness requirements, with the Onebed X and Yinahla offering generous profiles that prevent bottoming out.
Edge Support
Why it matters: Heavier bodies create more pressure at mattress edges, which can collapse without proper reinforcement.
What to look for:
- Reinforced perimeter coils in hybrid mattresses
- Foam encasement around the coil system
- Dense foam rails along the edges in all-foam designs
Temperature Regulation
Why it matters: Heavier bodies generate more heat and sink deeper into mattresses, potentially trapping warmth.
What to look for:
- Gel-infused or copper-infused foams
- Phase-change materials in covers
- Breathable latex layers
- Coil systems that allow airflow
- Cooling covers with moisture-wicking properties
The Onebed X addresses this with gel-infused memory foam and a breathable cover, while the Peacelily’s natural latex provides excellent natural temperature regulation.
Durability & Warranty
Why it matters: Heavier bodies accelerate wear and tear on mattresses.
What to look for:
- Warranties of 10+ years (15+ ideally)
- High-density foams (3.5+ pcf for memory foam, 1.8+ pcf for polyfoam)
- Natural latex components for longevity
- Reinforced stitching and quality covers
- Hand-tufting or other anti-shift construction methods
The Peacelily stands out with its 25-year warranty, while Onebed, Yinahla, and Big Fig all offer 15-20 year warranties that reflect confidence in their durability.
Firmness Level
Why it matters: Heavier bodies sink deeper into mattresses, making them feel softer than they would to lighter individuals.
What to look for:
- Medium-firm to firm (6-8 on the 1-10 firmness scale) for most heavier sleepers
- Adjustable or dual-firmness options if you’re unsure
- Consider your sleep position:
- Side sleepers: Medium-firm (to prevent pressure points while maintaining support)
- Back sleepers: Firm (for proper spinal alignment)
- Stomach sleepers: Very firm (to prevent hip sinking)
What’s the difference between weight capacity and durability for heavier sleepers?
Weight capacity refers to the maximum weight a mattress can safely support without structural failure. Durability refers to how well a mattress maintains its supportive properties over time under regular use.
For heavier sleepers, a mattress might technically support your weight (meeting capacity requirements) but still wear out quickly (poor durability). Look for both high weight capacity AND construction features that enhance longevity, such as high-density foams, reinforced coils, and quality materials.
I’m a heavier side sleeper. Should I still choose a firm mattress?
Heavier side sleepers need a balance of support and pressure relief. While you need more support than lighter side sleepers, an ultra-firm mattress might cause painful pressure points at the shoulders and hips.
Consider a medium-firm mattress with targeted pressure relief, like the Onebed X or Sleeping Duck Mach II.
Are memory foam mattresses good for heavier people?
Pure memory foam mattresses are generally not ideal for sleepers over 100kg, as they tend to sink too deeply and retain heat. However, hybrid mattresses that combine memory foam comfort layers with supportive coil systems (like the Onebed X) can work excellently for heavier individuals.
If you love the pressure-relieving feel of memory foam, look for hybrids with:
- High-density memory foam (at least 4 pcf)
- Cooling technologies like gel or copper infusion
- A substantial coil support system underneath
- Transitional layers to prevent sinking too deeply
How often should heavier individuals replace their mattress?
While most mattresses have a lifespan of 7-10 years, heavier individuals may need to replace their mattresses more frequently due to accelerated wear. On average:
- Standard mattresses: Every 5-7 years for sleepers over 100kg
- Specialized durable mattresses: Every 8-10 years
- Budget mattresses: Every 3-5 years
Signs it’s time to replace include visible sagging, decreased comfort, waking with pain, or feeling like you’re “bottoming out” through the comfort layers.
Conclusion: Finding Your Perfect Support System
Finding the right mattress as a heavier sleeper is about more than comfort—it’s about long-term support, durability, and overall health.
We’ve provided a carefully researched selection of some of the best mattresses available to Australians today, each offering features suited to a range of needs and preferences.
While we conducted rigorous research to create this guide, it’s important to remember that comfort is personal. We encourage all Australians to take advantage of trial periods and test mattresses at home to find the option that truly suits their body and sleep style. To find more options check out Onebed’s collection of single, king single, double, queen and king mattresses.
