Ergoflex® 5G Mattress-In-A-Box

8235 Reviews

Premium Sleep. Perfected Over 15 Years.

Trusted by Australians since 2010, the Ergoflex® 5G combines premium high-density memory foam, medium-firm orthopaedic support and over 15 years of continuous refinement to deliver exceptional comfort, pressure relief and long-lasting durability.


BestMattress for Back Pain Winner 2026
  • Medium-firm comfort & support
  • Proven to help relieve pressure & back pain
  • Premium high-density memory foam
  • Advanced airflow design for cooler sleep
  • Compatible with adjustable beds
  • Trusted by Australians since 2010
  • 30-night home trial

Our Price

   $

MSRP

$


Saving $ with code

Mattress Size: 92cm x 188cm x 23cm

Buy Your Mattress


Old mattress recycling available

We offer collection and recycling of your old mattress in selected areas..
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* Free returns not applicable to some locations.

Experience the Ergoflex® Difference

The Highest Graded Mattress-in-a-Boxy

The Highest Graded
Mattress-in-a-Box

5th Gen True HD ACPT™ Foam
for class-leading performance and longevity.

Cool-Sleep™ Airflow System

Cool-Sleep™
Airflow System®

Temperature-regulating inner
core layer for cooler nights.

Tried-and-Trusted 10-Year Warranty

Tried-and-Trusted
10-Year Warranty

For Perfect Support
and comfort

Accessible, Helpful Customer Care

Accessible, Helpful
Customer Care

Award winning service. You can
speak to us every day of the
year by calling 1300 791 753.

Trusted Reviews from Long-Term Customers

Trusted Reviews from
Long-Term Customers

Our reviews are real, honest
feedback rather than
fleeting first impressions.

Anti-Allergenic


Anti-Allergenic

OKEO-TEX® 100 Certified
Ideal for asthma & allergy sufferers.

The Ergoflex Mattress in a Box

What is the Ergoflex® Mattress-In-A-Box?

The Ergoflex Mattress-In-A-Box is a high-quality, orthopedic memory foam box mattress that offers incredible support and comfort. Made with Ergoflex's 5th Generation True HD Proprietary Foam, this mattress moulds to your body for optimal pressure relief — ensuring a great night's sleep, every night. The Cool-SleepTM Airflow System keeps things cool while the removable, washable TENCEL® cover is naturally anti-allergenic, making this the perfect mattress for allergy and asthma sufferers. Since 2006, Ergoflex has been a leader in the mattress industry with thousands of 5-star reviews, helping people get a good night's sleep Australia-wide.

Wondering what a mattress-in-a-box is? Unlike regular mattresses, a box mattress is compressed, vacuum-sealed and packed in a box for convenient delivery. Setting it up is super easy: just unbox it, put it on your bed frame, and watch it expand to full size in a few hours. This convenience and flexibility makes Ergoflex the best memory foam mattress for those looking for convenience and top-notch quality.

Ergoflex® vs Regular Mattresses

Regular Mattresses

Cross Not made for back pain.
Cross Traps heat due to poor temperature regulation and airflow.
Cross Not anti-allergen or hypoallergenic.
Cross

Noisy to get on and off the bed at night.
Cross Limited warranty or guarantee.

Ergoflex®

Tick Made with True HD memory foam for exceptional orthopedic support.
Tick Features the Cool-SleepTM Airflow System to prevent hot, uncomfortable nights.
Tick Comes with an anti-allergenic TENCEL® cover.
Tick Whisper-quiet Visco-elastic memory foam to reduce partner disturbance.
Tick Reliable 10 Year Warranty.

How Do Memory Foam Mattresses Work?

Pressure-Relieving Support
For All-Night Comfort.

The Ergoflex® 5G Mattress-In-A-Box is a 5-layer memory foam mattress crafted from premium materials designed to work together, delivering unmatched support, comfort and pressure relief.

The TENCEL® outer cover offers a luxurious, breathable surface that feels natural and soft, while the micro-fine inner cover protects the mattress core.

On top, a 9cm layer of high-density visco-elastic memory foam contours to your body, providing exceptional support and eliminating partner disturbance for uninterrupted sleep. Beneath this, the Ergoflex® 5cm Cool-Sleep™ airflow system promotes air circulation and temperature control. Finally, the 9cm high resilience impact-resistant foundation layer supports the upper layers and ensures lasting durability.

What Size Mattress is Best For You?

Next-Day Delivery & Free Returns
Single Mattress

92cm x 188cm x 23cm

Next-Day Delivery & Free Returns
Long Single Mattress

92cm x 203cm x 23cm

Next-Day Delivery & Free Returns
King Single Mattress

106cm x 203cm x 23cm

Next-Day Delivery & Free Returns
Double Mattress

137cm x 188cm x 23cm

Next-Day Delivery & Free Returns
Queen Mattress

152cm x 203cm x 23cm

Next-Day Delivery & Free Returns
King Mattress

183cm x 203cm x 23cm

FAQs About The Ergoflex® 5G Mattress-In-A-Box

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What To Consider Before Buying A Mattress

Support and comfort

Support and Comfort

Picking a mattress is all about finding the right support and comfort. The Ergoflex® 5G mattress has a multi-layer memory foam structure that's great for back pain. Its True HD memory foam contours to your body, offering perfect support and pressure relief. This means you get a comfortable, pain-free sleep. If you're unsure what level of support you need, our team can give you expert advice to help you find the perfect mattress.

Temperature Regulation

Temperature Regulation

Nobody likes sleeping hot. Traditional mattresses can trap heat, but the Ergoflex® 5G mattress has the Cool-SleepTM Airflow System to keep things cool all night long. This helps you stay comfy and enjoy a great night's sleep. Plus, with our convenient delivery, you'll be enjoying your new mattress in no time.

Anti-Allergenic

Allergies and Hygiene

If you have allergies or asthma, you'll want a mattress that's anti-allergenic. The Ergoflex® 5G uses materials certified by OKEO-TEX® 100 and CertiPUR-US, so it's free from harmful chemicals. Its TENCEL® cover is naturally anti-allergenic and resists dust mites, mould, and bacteria, keeping your sleep environment clean and healthy.


With various mattress sizes available, you can find the perfect fit for your body with ease. Not sure how much support you need? Our team can provide expert advice about whether the Ergoflex® 5G Mattress-In-A-Box is the perfect mattress for your body. Contact us today.

Ergoflex® 5G Mattress-In-A-Box Specifications

Standard Australian Sizes
High-Density Memory Foam
Adjustable Bed Compatible

Standard
Australian Sizes

High-Density
Memory Foam

Adjustable
Bed Compatible

Fast Australia -wide delivery
30-Night Home Trial
10-Year Warranty

Fast Australia
-wide delivery

30-Night
Home Trial

10-Year
Warranty

Materials & Certifications
  • Mattress: 5cm polyurethane HD memory foam.
  • 5cm cool-sleep airflow system for temperature regulation.
  • 9cm high resilience impact-resistant foundation base layer.
  • All foam CertiPUR-US certified.
  • Cover: 41% TENCEL™, 59% polyester, STANDARD 100 by OEKO-TEX® certified.
  • Protective inner cover.
  • No fire retardants used.
Sizes

Available in Single, Long Single, King Single, Double, Queen and King Size.

  • Single Mattress: 92cm x 188cm x 23cm, 24kgs
  • Long Single Mattress: 92cm x 203cm x 23cm, 24kgs
  • King Single Mattress: 106cm x 203cm x 23cm, 26kgs
  • Double Mattress: 137cm x 188cm x 23cm, 37kgs
  • Queen Mattress: 152cm x 203cm x 23cm, 39kgs
  • King Mattress: 183cm x 203cm x 23cm, 41kgs

In addition, we stock the following UK sizes:

  • UK Standard King: 150cm x 200cm x 23cm
  • European King: 160cm x 200cm x 23cm
  • UK Standard Super King: 180cm x 200cm x 23cm
Delivery

Next day delivery to Sydney, Melbourne, Brisbane, Canberra, Newcastle & the Gold Coast. 3 days to Adelaide and 5 days to Perth. Earliest delivery dates to your postcode and delivery fees are calculated at checkout.

The sizes and weights of each carton are:

  • Single Mattress: 96cm x 37cm x 37cm, 24kgs
  • Long Single Mattress: 96cm x 37cm x 37cm, 25kgs
  • King Single Mattress: 110cm x 37cm x 37cm, 28kgs
  • Double Mattress: 141cm x 37cm x 37cm, 37kgs
  • Queen Mattress: 156cm x 37cm x 37cm, 39kgs
  • King Mattress: 186cm x 37cm x 37cm, 41kg
Usage
  • Suitable for use with most types of bed frames, even adjustable electrics or divans.
  • Performs best on a completely flat, stable, or slatted base.
  • Ensure slats are no wider than 7.5cm apart.
  • Do not use directly on the floor or on a plywood board with no ventilation.
  • Rotate the mattress (head-to-toe) through 180° every month for the first 6 months and every three months thereafter, to aid longevity.
  • Protect against water damage with the Ergoflex-LIFE™ Tundra Mattress Protector.
Easy Care
  • TENCEL™ cover: unzip and remove, then machine wash in cold water on a delicate cycle.
  • Lay flat or hang to dry, or tumble dry on low heat. Do not use bleach.
  • Always allow the cover to dry completely before putting it back on your mattress.
  • Ergoflex® mattress core: spot clean by hand with mild detergent.
  • Dry at room temperature - avoid direct heat or light.
Return Policy & Warranty
  • The Ergoflex® 5G Memory Foam Mattress is covered by a 10-year warranty.
  • We offer a 30-night trial period and free return option from most metro areas.
  • From regional areas a return fee of between $100 and $250 may be applicable depending upon where you live.
  • The 30-night trial starts from the day your mattress is delivered and is limited to one return per household.

Zero Partner Disturbance,
So Everyone Can Get A Great Night's Sleep

Ergoflex® Is The #1 Mattress-In-A-Box in Australia

Ergoflex® has been setting the standard in the mattress-in-a-box market since 2006, almost a decade before many well-known brands emerged. We have stayed true to our mission of providing premium, long-lasting box mattresses exclusively online, offering great value without compromising on quality. With over 549 million nights of restful sleep delivered to hundreds of thousands of satisfied customers, we've built a reputation based on reliability and integrity.

Unlike other brands that started online, Ergoflex™ has remained focused on offering high-quality mattresses directly to consumers. While many brands boast 10-year warranties despite being relatively new to the market, Ergoflex™ stands out as the only mattress-in-a-box company that has been around long enough to prove our products' durability.

Our commitment to quality and customer satisfaction has been proven over the years, making us a trusted name in the industry.

Hygienic And Anti-Allergenic

Hygienic And
Anti-Allergenic

The Ergoflex® 5G mattress features a multi-layered design with built-in anti-allergenic properties, making it inherently antimicrobial and resistant to dust mites and allergens. This includes bacteria, mould, mildew, and fungi—common triggers for allergies and asthma. It is certified by both CertiPUR-US® and OKEO-TEX® 100.

10 year warranty

10-Year
Warranty

Ergoflex® mattresses come with an industry-leading 10-year warranty. We stand out as the only mattress-in-a-box brand that has been in the market long enough to prove our warranty's reliability. Our long history of consistent performance assures you that our mattresses truly live up to their promises.

Sleep Now Pay Later

Sleep Now
Pay Later

We've partnered with AfterPay and Zip to offer flexible payment options. You can pay for your ErgoflexTM mattress in four fortnightly payments or choose an interest-free plan over 3, 6, or 12 months. Simply select AfterPay or Zip at checkout, and start enjoying your new mattress right away.

Real Reviews. Real Experience.

Many mattress reviews are collected within days of delivery. At Ergoflex, we value feedback from customers who have slept on their mattress for months and even years.

That's why many of our reviews come from repeat customers and those who continue to recommend Ergoflex to family and friends.

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On the land and waters that we sleep, we walk, and we live, we acknowledge the Traditional Owners and Custodians of these lands. We pay respects to Elders past, present and emerging, and recognise their connection to the land.

Ergoflex in the UK    Ergoflex in Australia


Copyright © Ergoflex™ 2026

Ergoflex Australia, trading name of EAU Pty Ltd.
7/2 Sabre Close, Anambah Business Park, Rutherford,
NSW, 2320 ABN: 85 141 058 380

Call Us

mark.nelson@green-media.com

1300 791 753