Updated
July 17, 2026
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The Ergoflex 5G is the original mattress-in-a-box, and it has never chased fashion: it is a firm, high-density orthopedic memory-foam bed built to hug and support rather than bounce. Launched in the UK in 2006 and in Australia in 2010, it is pitched as an affordable TEMPUR alternative and is endorsed by back specialists for pressure relief. In this review we break down how it is built, how it feels, what it costs across every size, and who should (and should not) buy it.
If you sleep on your back or side, run hot on softer foam, or want a mattress that keeps a restless partner from waking you, the 5G is squarely aimed at you. Its high-density visco-elastic top layer and Cool-Sleep airflow layer are designed to relieve pressure at the shoulders and hips while holding the spine level.
The catch is the trial. Ergoflex gives you only 30 nights to decide, which is short in a market where 100 nights is now standard, and memory foam can take a fortnight to feel right. We treat that as a genuine con below.
Sleep Society rating
Ergoflex 5G ★★★★ 4.3/5
Firmness: Firm (medium-firm, ~7/10) | Queen: from $1,699 (check current price) | Trial: 30 nights | Warranty: 10 years
How it scores
Quality and comfort are excellent for orthopedic foam and the bed is easy to set up; value is fair rather than cheap, and perks lose points for the short 30-night trial where rivals offer 100.
The bottom line
The Ergoflex 5G is the mattress to buy when you want firm, orthopedic memory-foam support and are done experimenting. Its high-density foam, TEMPUR-like feel, near-zero partner disturbance and back-specialist endorsement make it a standout for back and side sleepers with aches. It is not cheap, it is all-foam so it lacks the bounce of a spring hybrid, and the 30-night trial is stingy, but for dedicated firm support it is an easy recommendation.
We assess every mattress on the same five criteria – quality, value, comfort, ease of use and perks – using the brand’s published construction, aggregated owner reviews from ProductReview.com.au and CHOICE, and hands-on assessment of the feel, cover and setup. We re-check pricing on the brand’s live page at each update.
The Ergoflex 5G suits back and side sleepers who want firm, orthopedic pressure relief, anyone recovering from injury or dealing with aches, and couples who need genuine motion isolation. Its firm, contouring feel makes it a strong pick for our best mattress for back pain and side sleeper guides, and the Cool-Sleep airflow layer helps it place on our hot sleeper list. Sleepers who want a soft, springy or adjustable feel, and those who need a long risk-free trial, are better served by an all-rounder like the Ecosa.
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"I had been wanting to update my mattress for some time due to shoulder injury. What a buy! Love this mattress, It's supportive yet gentle on my bones. Very happy." Rhonda - Ergoflex Mattress Review
The Ergoflex 5G is a 23cm all-foam mattress built around three foam layers inside two cover layers. From the top:
The foams are CertiPUR-US and OEKO-TEX Standard 100 certified, and the mattress ships compressed in a box.
Ergoflex Pillow Review - The same high-density visco-elastic memory foam used in the Ergoflex™ 5G mattress is also in the Ergoflex HD pillow. Which means it’s comfortable like the mattress and it's also designed to deliver ergonomic posture support for your head and neck.
Memory foam pillows will take on your shape for immediate pressure-relief and instant comfort lasting the entire night, every night. Naturally the pillow is anti-allergenic and anti-microbial. This results in a beautifully healthy and hygienic pillow, encased in a TENCEL® cover.
Origin Mattress
The Best Value for Money Hybrid Mattress In Australia → Origin Mattress
The 5G sits around 7 out of 10 on the firmness scale – a genuinely firm, medium-firm feel. You sink into the high-density top layer and it holds you level, which is why back and stomach sleepers and heavier bodies get on with it so well. Side sleepers still get pressure relief at the shoulders and hips thanks to the contouring memory foam.
This is a highlight. The dense foam absorbs movement almost completely, so you barely feel a partner get in or out of bed – among the best motion isolation of any bed-in-a-box.
The open-cell 5G foam and dedicated Cool-Sleep airflow layer move more heat than traditional memory foam, so it runs cooler than most all-foam beds. A pocket-spring hybrid will always breathe more, but the 5G is a fair pick for warm sleepers who still want the memory-foam hug.
There is a mild new-foam smell on unboxing that clears within a day in a ventilated room.
| Size | Dimensions (cm) | Price (from) |
|---|---|---|
| Single | 92 x 188 x 23 | $949 |
| King Single | 107 x 203 x 23 | $999 |
| Double | 137 x 188 x 23 | $1,299 |
| Queen | 153 x 203 x 23 | $1,699 |
| King | 183 x 203 x 23 | $1,899 |
Type: all-foam · Firmness: firm (~7/10) · Height: 23cm · Trial: 30 nights · Warranty: 10 years · Prices are RRP checked July 2026; Ergoflex runs frequent sales, so confirm the current price before you buy.
The Ergoflex 5G starts from $949 for a single and runs to $1,899 for a king, with a queen from $1,699 at RRP. That places it at the upper end of the bed-in-a-box market, justified by the high-density orthopedic foam, TENCEL cover and back-specialist pedigree rather than by extras. Ergoflex discounts heavily and often, so the live price is usually well below RRP – always check before you buy.
"We've never slept on a mattress this good and we've tried many mattresses before the Ergoflex. Thank you for making such a fantastic mattress. Sleeping on this mattress is magic. My body thanks you!" Lidia K. - Ergoflex Mattress Review
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Ergoflex ships free across Australia and offers free next-day delivery on in-stock orders. The mattress arrives compressed in a box; you slide it into place, cut the plastic and it expands over a few hours. Metro returns during the trial are free, while regional returns may carry a collection fee, so check your postcode before you buy.
With a 10-year warranty and high-density, CertiPUR-US-certified foams, the Ergoflex 5G is built to resist sagging and hold its shape across a typical 7–10 year mattress lifespan. Rotating it head-to-toe every few months and using a protector will keep it in good condition; the dense foams are its main defence against the body impressions that shorten a cheaper foam bed’s life.
Yes. The firm, high-density orthopedic foam holds the spine level and relieves pressure at the shoulders and hips, which is why it is endorsed by back specialists and popular with injury and pain sufferers.
It sits around 7 out of 10 – firm but not rock hard. Back, stomach and heavier sleepers tend to love it; dedicated soft-mattress fans may find it too firm and should consider a softer or adjustable bed.
It runs cooler than traditional memory foam thanks to the open-cell 5G layer and the Cool-Sleep airflow layer, but a pocket-spring hybrid will always be more breathable.
It is short. Memory foam can take up to two weeks to feel right, so 30 nights leaves little margin. If a long risk-free trial matters to you, an all-rounder like the Ecosa with 100 nights may suit better.
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Still deciding? Start with our best mattress in Australia guide.
