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9Sleep Republic King Mattress

Sleep Republic King Mattress

 Verified🏆 2026
9Sleep Republic King Mattress
4.8

505 reviews

Positive vs Negative
97%3%
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Sleeping Position
  • Side
  •  · 
  • Back
  •  · 
  • Front
Adjustment Period
  • Days
  •  · 
  • Weeks
  •  · 
  • Months
  •  · 
  • I never got used to it!
Perceived Firmness ?
  • Very Soft
  •  · 
  • Soft
  •  · 
  • Medium
  •  · 
  • Hard
  •  · 
  • Very Hard
Pre-existing Neck / Back Issues ?Yes · No
Caused Discomfort ?Yes · No
Heat Retention ?Yes · No
Sagging ?Yes · No
Value for Money
4.8
Customer Service
4.8
5 Joe E  · Love it - big, soft and comfy. I used to wake up with a sore back, but since getting this mattress I don't! Woohoo.
5 Ridgie  · Great mattress, very comfortable, just the right firmness, love it.
5 Imogen  · Very happy with this purchase! Easy to assemble with the bed base, comfortable. Would definitely purchase again
5 joshua.sutcliffe  · Very happy with the mattress, very comfortable and build quality looks quite good.
4 chortlepuss  · Excellent mattress, let down by delivery (mattress left outside no door knock so my neighbour had to let me know it had arrived)
5 Nathan Goodall  · The most comfortable mattress ever, previously had a Sleeping Duck, this is heaps better.

Reviews with attachments

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Suzy B
Suzy BNew South Wales3 posts
  Fair Incentive Verified King

Great mattress! As a long time side sleeper and back pain sufferer I can get pretty stressed about buying a new mattress. The sleep republic mattress is firm and supportive without being too hard, I can sleep on my side all night without my hips getting sore. Great service and quick delivery. Would highly recommend :) Show details ·  1

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Tim B.
Tim B.SA
  Fair Incentive Verified King

Mattress is great. Previous mattress was Snooze own brand madison time square. They still sell it but they don't advertise number of springs, thickness of foam layers, number of layers or show a cross-section. It was great for 11.5 years but woke up in pain every day for 4 months and eventually would feel pain immediately upon lying down. Bought… Read more ·  1

originally on super discount with family friend staff discount ie 66% off full retail.

Sleep Republic reviews are amazing, score on Product Review is amazing and score and review on Bed Buyer website is great.

Arrived quickly, been great since day one.

Springs feel very firm... but are medium firm officially... very firm in the sense they are supportive and feel like they cradle and push back. Smaller springs that are thicker means they should last longer and my weight is spread over more springs so each one will have an easier life.

Sleep Republic have gone all in on the spring quality with basic but tried and trusted foam layers.

Google the origins of the company- ​"Origin and History ​Founding and Experience: The company was founded by mattress industry veterans, including founder Mark Ottley, who has decades (stated as over 30 years in some sources, and over 20 in others) of experience in designing, manufacturing, and selling mattresses.

​Motivation: Ottley noticed the confusion and lack of honesty for consumers when buying mattresses, with many models being difficult to compare. He set out to create a simplified, high-quality product based on customer needs—medium-firm support, temperature regulation, and premium materials—and deliver it directly to the customer as a "mattress in a box." "​In summary, Sleep Republic's history is about moving away from confusing traditional mattress retail to offer a direct-to-consumer, scientifically-backed, and quality-focused hybrid mattress based on the decades of knowledge of its founders.

At time of review full retail price of my old madison time square king size from Snooze is $6799, Sleep Republic mattress paid $1400 with delivery included.

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Nicole
Nicole
  King

Absolutely love it!! I was so skeptical buying a mattress in a box, and dread the whole mattress shopping experience from past mistakes and horrible beds. I’m particularly precious… not too soft not too firm. I mentioned to my chiropractor I was mattress shopping and she asked if I had heard of Sleep Republic. She is not affiliated with them in… Read more ·  1

any way but said she has one and couldn’t recommend it enough and now a few of her clients also have them and love them. I am so in love with my mattress. It is an absolute cloud and so supportive. I’m so happy to be back in it after a work week away in hotel beds! I read reviews prior to purchasing that indicated they could be firm, but with the 150 day trial I figured it was worth the try! And I’m so glad I did!!! 10/10! Super quick delivery, easy to set up and it gives the dream sleep!

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e-ck
e-ck2 posts
  Fair Incentive Verified King

Extremely satisfied with our purchase of a king sized Sleep Republic mattress. We had already purchased a queen and a single for our new home and once we tried the new queen mattress in our spare bedroom we decided to order a king for our main bedroom as well. Firm but plush feel, very supportive and provides a really refreshing nights sleep. I… Read more ·  1

suffer from a mild form of arthritis and I’ve found my body has been reacting in a very positive way since we purchased our Sleep Republic mattresses.

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Joddle
JoddleVictoria2 posts
  Fair Incentive King

Finally a mattress I can keep – Sleep Republic is the 4th mattress I've tried in my journey to purchase a new mattress and I've finally found the one I'll keep. It's super supportive in the springs while being soft on top with the foam. I have arthritis and so far it's supportive for me and I'm not waking with pain. Show details ·  1

In-depth reviews

Immy S
Immy SNSW
  Fair Incentive Verified King

You may look at the price of these mattresses and think why would I spend that much but did you know you spend about a third of your life sleeping? Why compromise on a horrible mattress when you could get a sleep republic mattress. My dad recommended us these mattresses as he has had one for the past 7 years. His mattress still feels as good as… Read more ·  1

our brand new one. We have had ours for about a year now and not a night goes by where I wish we had a different mattress. With a perfect mix of firm but still cloud like. The previous mattress we had would dip in the sides where my partner and I would sleep and was causing us to wake up with stiff backs but with our sleep republic mattress we have never had this problem. Since we have bought our sleep republic mattress our sleep has improved immensely. For my partner and I this is the best investment into our sleep we have ever made. No i am not being paid for this review i am just a normal 22 year old Australian mum who cherishes an amazing night sleep, and truely believes that these mattresses provide just that.

DNP
DNPQLD
  Verified King

Replacing our old mattress of 20 years, and being sceptical of buying something 'sight unseen' we started to look at the standard bricks and mortar options and based on preferred options would have been looking at spending over 5K. Decided to take the plunge of the mattress in a box, buy online option and after some online research settled on… Read more ·  1

Sleep Republic King size, having the 150 sleep night guarantee offered some peace of mind, along with the overall 12 year warranty. All concerns were immediately put to rest from the time of purchase through to the first nights sleep. Emails and updates regarding the purchase and shipping information were regular and timely. Mattress arrived on time and as promised, unboxing went as described and expected but the real surprise came from the mattress itself, the quality of workmanship is instantly evident as soon as you see it and lay on it. It is by far the most comfortable mattress we have ever slept on, exactly as described, firm enough to offer amazing support, regardless of sleeping position or body weight, yet feels incredibly soft and comfortable at the same time. Partner disturbance is non existent when the other moves around and have had amazing full nights sleep every night since day 1. The only regret we have is that we didn't make this purchase earlier. Highly recommend.

Linda M.
Linda M.
  King

So happy with this mattress! – Exceptional customer service from Sleep Republic and Tanya in particular and here’s why! From the moment I placed my order, Tanya kept me updated almost daily when there were unavoidable delays, which made all the difference. First, the sheets: they arrived before the mattress, and the quality is amazing—soft like satin but without the shine.… Read more

The fit wasn’t quite right, but returning them was a breeze, and they were replaced quickly at no extra cost. They’re not cheap, but honestly, worth every cent! Real luxury.

Now, the big one—the mattress. I was skeptical about a “mattress in a box” and did my research and looked at online reviews (Koala, Emma, etc.), and I’m glad I chose the Sleep Republic mattress - the quality is unbelievable. At a fraction of the cost of what we tried at Forty Winks, it’s been super comfy from day one. We did want a mattress that was slightly on the firmer side as our old mattress was too soft. This mattress delivers and I’m having the best sleep ever.

There was a tiny issue with the mattress when it arrived—not a big deal, but I wanted it to be perfect. Sleep Republic immediately swapped it over, no questions asked. That kind of hassle-free return policy is rare.

Finally, a shoutout to Tanya who has been great. Nothing was ever too much trouble, and she always made me feel valued, never like I was complaining. If you want a top-quality mattress at a really reasonable price I’d really recommend this company.

Positive reviews

Rina B.
Rina B.NSW3 posts
  Verified King

Very comfortable, my husband said little firm for him but for me it was perfect. I have hip issue and osteoporosis its perfect for me no aches and pain when I wake up. Show details ·  1

Freyja
Freyja
  Fair Incentive Verified King

We’ve had our Sleep Republic king mattress for a while now and I honestly wish we’d bought it sooner. It’s that perfect balance of supportive without being too firm — you feel held, not sunk into. What I love most is how well it handles movement. Even with someone else getting in and out of bed (or the occasional small human sneaking in… Read more ·  1

overnight), it barely disturbs my sleep. Huge win.

It’s been great for my back and hips — I wake up without stiffness, which I didn’t realise had become my “normal” until it was gone. It also stays comfortable through the night and doesn’t trap heat, which matters more than you think.

Delivery was easy, setup was straightforward, and it expanded beautifully. Overall it feels like a genuinely high-quality mattress without the ridiculous showroom pressure or price tag.

If you’re on the fence: do it. Sleep Republic has absolutely delivered on comfort, support, and value.

Jason L
Jason LNSW
  Fair Incentive Verified King

Love the Sleep Republic Luxe Mattress. It felt comfortable from the first night with a proper medium-firm feel and strong support, especially for side sleeping. Movement transfer has been low so you don’t get jolted when your partner turns over, and the edges feel stable so you can use the full mattress. It seems to sleep at a neutral temperature and so far feels well made. Show details ·  1

Negative reviews

Tom
TomNSW
  Fair Incentive Verified King

I ordered a mattress almost 4 weeks ago now and it still hasn’t arrived despite the 7-14 business days estimate. Customer service have confirmed it is still yet to even be picked up by the courier. If I’d have known it could take this long I would have been more inclined to purchase from another mattress company. Whilst I understand there can be… Read more

delays from time to time and this review is probably more of a reflection of the transport company but it has still been a disappointing experience.

Hopefully the mattress is worth it when it arrives.

Sleep Republic
Sleep Republic    

Hello Tom, We’re truly sorry to hear about the… Read more

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Kelly
Kelly3 posts
  King

Very hard mattress. I could feel the hard springs and it definately caused whole body pain for me, felt like I'd been beaten with a bat most mornings. Caused pinched nerves in my shoulders. I spent a lot of money on chiros, physios, massage for a month but what ultimately stopped the pain was not sleeping on it and purchasing a nice new mattress.… Read more

2 stars for a very easy return process. Make sure you have the correct base and use a mattress protector. Charity picked it up within the week on a day convenient to me. Sleep republic refunded the next day.

Sleep Republic
Sleep Republic    

Hi Kelly, Thank you for taking the time to share… Read more

Disappointed Adelaide
Disappointed AdelaideSA2 posts
  King

Don’t be fooled – Incredibly disappointed. We bought a queen mattress and base in 2021 for our guest room with great reviews from friends and family who stayed. Our mattress needed replacing so thought we should try this one, thinking we had a 100day return as per their sites claims. We got the mattress and started having horrible hip and low back pain, perhaps… Read more

it’s because we are bigger people? Perhaps it’s our bed frame? Tried to send it back after 3 weeks, well within the 100days, thinking we had the right to do so. Apparently not, because “our household” purchased a mattress 3 years ago, even though we never slept on it, we are not entitled to a return. Granted, I should have read the fine print, but when the big bold text claims 100 days and we don’t stuff you around like the other guys, you think you’re dealing with a decent company. You’re not.

Sleep Republic
Sleep Republic    

Thank you for sharing your feedback, and we’re… Read more (+1 reply)

Recent reviews

Karin
KarinQLD
  King

This mattress has been comfortable from day one. I have multipal issues with my back, hip and neck and this mattress feels so supportive but still nice a soft against the sore points. I haven't woken up as stiff and sore as I did with my old lattex mattress. I would highly recomend this mattress and the company for a great product, easy delivery and reasonable prices. Show details ·  1

Danny N.
Danny N.2 posts
  Fair Incentive Verified King

Sleep republic mattress lives up to its name!!!!! So happy with my purchase. Previously used hybrid origin which had its issues that sleep republic rectified with its high quality mattress Show reply

Carolyn Franklin
Carolyn Franklin2 posts
  Fair Incentive Verified King

We did a lot of research after having a mattress we didn’t love for way too long. We got the Luxe mattress, and we have found it to be very comfortable, minimal partner disturbance, and so far, no big hill in the centre (as with our previous experience) Show details ·  1

 Follow-up  · To follow up, the unboxing was relatively easy, I would recommend two people for this part!. To be honest I am not sure about the mattress being cooler - I am a hot sleeper!. I have a cotton mattress protector also. The mattress arrived very promptly, we got updates so we knew exactly when it was coming.

Sam
Sam2 posts
  Fair Incentive Verified King

Purchased King luxe mattress in early September 2025 and received early October 2025. I didn't realise there was going to be a delay when ordering so the month delivery time was annoying. The package was extremely heavy and needed 2 men to take upstairs. Otherwise the mattress itself has been great, just minor issues around the… Read more ·  1

administration/delivery of the order. I also find it hard to lift the mattress to tuck the fitted sheets in so keep this in mind.

Sallym10
Sallym10QLD2 posts
  Fair Incentive Verified King

Fantastic matress, we have had it a few months and sleep has improved for both myself and my partner - his back soreness has improved and we both get a better night sleep because less partner disturbance. Very comfortable, would buy again! Show reply

Manjit S.
Manjit S.VIC4 posts
  Verified King

As a light sleeper, switching to Sleep Republic mattress, I've been sleeping well. The mattress is zero partner disturbance which does not disturb me when my wife gets on or out of bed. It is a high quality mattress, I'll recommend anyone who wants a good sleep. Show reply

Rein H
Rein HNSW2 posts
  Fair Incentive Verified King

Have been using the King mattress for almost 3 weeks since it was delivered. The mattress is heavy, but since the package has 2 wheels, it is possible for 1 person instal / unpack - its weight, sturdiness and apparent quality is likely indicative of its durability and long life. As a side sleeper, I have found the mattress to be reasonably firm… Read more ·  1

with a softer top layer that makes it comfortable and supportive. It takes a while for the body to get used to the mattress, but I have already noticed an improvement to lower back and leg pain and expect further future improvement. The mattress is quite tall, so mattress protectors and fitted sheets will need deep walls.

Mattresses

Find out how Sleep Republic King Mattress compares to other Mattresses

Know better, choose better.

Compare all
Andrew
AndrewVIC
  Fair Incentive Verified King

Mattress has been good but not great. Definitely more support and comfort than our 12yo previous mattress, and it is a comfortable bed to sleep in and also sit in and read a book. Is it at the top level? Probably not but that is probably down to the price you pay. Spent a long time researching including going to mattress retailers and lying on… Read more ·  1

beds. The question marks on the actual mattress are it seems to retain heat, and is very hot very quickly. We would have loved a flat surface to lay on rather than the undulations of the mattress stitching. Also of note, we are already rotation the mattress to account for the indentation of the body’s from sleeping. So we are concerned about a bit of early sagging. The 100 night free trial offer seems fantastic but in reality can you be bothered? What would we do in the meantime if we sent it back? Anyway. Happy but very much watching this space as can see another upgrade in the future.

Daniel I.
Daniel I.
  Fair Incentive Verified King

Excellent comfort. Delivery team were super helpful and updated timings. We risked picking Australian supplier over global given we have come from the uk and ordered Emma mattress before and don’t regret it what do ever ! It’s very comfy ! Show details ·  1

Maddison
Maddison
  Fair Incentive Verified King

So happy with purchases from sleep republic. Mattress is firm, but so comfortable. I wake up feeling rested and don’t have sore neck or back. Mattress has maintained its shape and hasn’t resulted in any sagging. We also bought the low profile pillows and they are fantastic!!!!!!!!!!!! I highly recommend sleep republic. Show details ·  1

Andrew W
Andrew WVIC
  Fair Incentive Verified King

We’re very happy with our new mattress. It’s our second from Sleep Republic. This time we opted for the luxe option and so far it’s very comfortable. The king size is great. We won’t go back to Queen. Show details ·  1

Ahmed IG
Ahmed IGNSW28 posts
  Verified King

I recently purchased the Sleep Republic mattress, and it has been a noticeable upgrade in comfort and support. The mattress has a firm and stable feel without being too hard, and for someone around 100 kg, it provides excellent support without sinking. The edge support is also strong, which makes sitting on the sides of the bed much easier. Since… Read more ·  1

switching to it, my back has felt much better, and my sleep quality has improved overall. It feels well-built and offers great value for money.

I strongly suggest taking off the wheels attached to the delivery box before bringing it inside if you do not have carpet, because they scratched my new flooring. One point down for that!

Apart from that, the mattress itself has been excellent, and I highly recommend it.

Jamie R.
Jamie R.
  Fair Incentive Verified King

This is the second mattress I’ve bought from sleep republic as we upgraded to a king from a queen. Aches and pains are so much less in only a week of using the mattress. We had upgraded to a king but the mattress was not supportive and could feel each other movement through out the night. Now we are sleeping through the whole night and not waking each other up. Thanks again SR! Show details ·  1

Swacgo
SwacgoQLD7 posts
  Fair Incentive Verified King

After much consideration and after reviewing many other ‘Mattress In a Box’ retailers I finally chose Sleep Republic. From night 1 sleep was heavenly. Comfortable, Firm, Quality Construction, Firm Edges, No over heating or partner disturbance. After having recent spinal surgery this is just what the doctor ordered. Despatch was quick and setting up simple. Show details ·  1

Jessika S.
Jessika S.VIC2 posts
  Fair Incentive Verified King

I have had back surgery and lower back issues. I was waking during the night with back pain as my back was unsupported. I now sleep all the way through with my new mattress and don’t wake up sore and stiff. The mattress is quite firm so as a side sleeper initially my shoulders got a little sore. I have adjusted and now sleep well. Reasonably priced for what you get Show details ·  1

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