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Part of Sleeping Duck Mattress 4.8 
6Sleeping Duck Mattress Medium King

Sleeping Duck Mattress Medium King

 Verified🏆 2026www.sleepingduck.comMPN: SDMAT-KNG-MED
6Sleeping Duck Mattress Medium King
4.9

1,635 reviews

Positive vs Negative
98%2%
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Sleeping Position
  • Side
  •  · 
  • Back
  •  · 
  • Front
Pre-existing Neck / Back Issues ?Yes · No
Value for Money
4.8
Customer Service
4.9
5 steve  · best sleep we have had for a long time, excellent mattress and base, built to last as you can feel the quality.
5 Renee McLean  · Extremely comfortable mattress and great delivery and set up service. We bought SD mattresses for the kids too!
5 Nicole Tan  · Best mattress I ever bought! Love it. Hope it lasts.
5 Simon ford  · Very happy very comfortable and extremely good for its price
5 Kerry Kruger  · I am happy with my Sleeping Duck mattress it is extremely comfortable and gives me plenty of support. I think it is going to be extremely durable.
5 Bernadette  · Excellent service. My elderly Mother absolutely loves her new mattress. Thank you

Reviews with attachments

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Hugh M.
Hugh M.VIC13 posts
  Verified Mattress Medium King

⭐️⭐️⭐️⭐️⭐️ This is our second time purchasing from Sleeping Duck, and once again they have absolutely delivered. The ease of navigating their website and placing an order is seamless. The option of guaranteed next-day delivery - or being able to properly plan your delivery - is outstanding and removes any stress from the process. We recently… Read more ·  1

upgraded both the base/style and mattress from our original purchase, and the entire experience was exceptional from start to finish. Customer service, which has always been second to none, has somehow improved even further. The communication throughout - emails, calls and texts - was proactive, clear and professional. A big shout out to Steph, Zoey and the wider team for their outstanding support.

On delivery day, everything worked like clockwork. From Customer Service coordination to the installation team onsite, it was clear everyone operates in unison. The installation crew were fantastic - positive, capable, professional and even up for a laugh. No issue fazed them.

Despite the challenges of a second-storey delivery and a sloping driveway, the team handled everything effortlessly. Installation took just on an hour, and their workmanship and care were evident throughout. Well presented, well organised and clearly masters of their craft.

Their sheet sets, duvets, and overall quality of their products is amazing, we just bundled everything for ease.

We genuinely cannot fault Sleeping Duck.

We’ll be back again and again.

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JustAnotherOpinion
JustAnotherOpinion16 posts
  Verified Mattress Medium King

A way better adjustable mattress that can be cleaned and modified! – We have had a Sleeping Duck SD Mach II mattress for about two months. The whole process from order to delivery to unwrapping was easy and seamless. The mattress is quite heavy to move but is perfectly manageable by two people. The mattress is well constructed, with a removable (zip) cover that can be washed. Underneath this is a blue… Read more ·  1

'anti-gravity' layer (pictured) which appears to be in it's own removable cover (zip2). Beneath that is another removable (zip3) 'ComponentAdapt' cover that contains the precision adjustment pads. Beneath this is the main mattress body which appears to be a non-adjustable unit containing springs. With this construction the mattress can be rotated but not flipped.

Our mattress shipped with two full length precision pads. We chose Medium when we ordered the mattress, but it also came with a 'Firmness Adjustment' offer for 100 days which has allowed us to get smaller precision pads to vary the firmness of the mattress for hips and shoulders on each side. The smaller precision pads for our King size mattress seem to come in either a 1/5 or 1/10 size pad. The 1/5 size pads are currently (Aug24) available in either Soft, Medium, Firm or Extra Firm and the 1/10 size pads in either Medium or Firm. Sleeping Duck encourage you to try each arrangement for 3 weeks which we did. I then spoke to someone at Sleeping Duck who helped me work out how we could adjust the mattress to get a little more support under the hips and a little less under the shoulders. They sent me the precision pads which were easy to install and gave my wife and I our own customised fits. They have since supplied us with a couple of extra pads to fine tune this even further. All at no cost to us. Amazing.

Is it comfortable - for me, yes. I have back and neck issues and rarely sleep through the night and the quality and duration of sleep I get is far better. We recently stayed at a fancy resort with plush beds and I found myself wishing for my Sleeping Duck! I love that I have been able to add extra support under my hips but also to give more softness under my shoulder while still supporting my head. It is far better and cheaper than our previous super expensive Tempur which was too soft in summer and too hard in winter. It is also far better and cheaper than our previous MySide which was awful, collapsed and was not supported by the company who sold it.

So dealing with the company from ordering through to support has all been amazing. So far the mattress which seems really well made has just been getting better and better. It's hard to say how the components will be after 5-6 years but what I do know is that the cover will have been washed and cleaned unlike our old MySide mattress and we can replace individual components inside the mattress (unlike wither mattress) if required. This gives me a very confident feeling that this is the mattress style of the future.

There is a leap of faith, ordering a mattress online without the ability to go to a showroom and try it. Sleeping Duck can't solve that completely but I have been super impressed by the commitment they have shown to making sure the mattress suits us. Thank you Sleeping Duck.

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John Archer
John ArcherNSW10 posts
  Mattress Medium King

Model Company for customer service – This mattress has only just been delivered and at first tryout is super comfortable however I would like to comment on their first class customer service. 1 They were always available on the phone for advice 2 The product arrived exactly when they said it would 3 Communication was perfect 4 The delivery guy was extremely polite and extremely helpful I wish that all purchases were as trouble free as this Show details ·  1

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Benno
BennoQLD9 posts
  Mattress Medium King

Absolutely sensational – 100% the best mattress we’ve ever slept on. We paid five times the amount from mattress from Harvey Norman about two years ago and it’s not even close in comparison. As soon as we got this baby out and slept on it the first night both me and my partner did not wake for one moment. Loving the medium. Not too soft not at all too firm. Perfect!!!! Thank you Duck genesis’s Customer service is amazing and extremely fast delivery. Couldn’t be happier Show details ·  3

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Joanne Flood
Joanne Flood
  Mattress Medium King

Is fabulous, just soo comfortable – It’s just fabulous, I wake up every morning and think, I’m so glad I bought this mattress. The comfort is incredible. We love it and I’ve recommended the bed to my family and friend Show details ·  1

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danrus84
danrus84VIC2 posts
  Mattress Medium King

BEWARE OF THE WHEELS ON THE MATTRESS BOX! DAMAGE ++ to floors. I wanted to give 5 stars as love the mattress but the box it came in destroyed some of my hard wood floor. The wheels were misaligned and damaged which caused metal brackets and chipped wheel to scratch the hell out of my hard wood floors. Customer service apologised but no offer of… Read more

any sort of compensation which was disappointing. They referred me to sleeping duck “get ready” email where they suggest to avoid wheels on hard floors. TBH I can’t even remember seeing this when I initially watched video. It would be difficult to avoid wheels on floors given they are screwed into the box. I had to unscrew them to avoid further damage to my floor and stairs when manoeuvrings up the stairs.

Better warning and emphasis on avoiding hard wood floors (perhaps big warning sticker on box or something) would have been helpful- maybe don’t put wheels on full stop…

Otherwise with regards to Mattress, we love it.

Sleeping Duck
Sleeping Duck    

Hi Daniel, we agree the Mattress is a heavy one,… Read more

Latest follow-ups

Marcel V.
Marcel V.VIC5 posts
  Mattress Medium King

Can't be happier with my purchase and service experience. I am one year in now to give the product time and I can't fault it. The buying experience was great as well, staff friendly, testing in store was great and no pressure. I got next day delivery which is wild, sadly couldn't pay cash, but overall very happy Show details ·  1

 Follow-up  · My review still stands as the best mattress I've had in my life. Keep it rotated every fortnight, it still feels like a new bed.

Kirrily
KirrilyQLD5 posts
  Verified Mattress Medium King

We are really happy with our mattress (we also purchased the indestructible bed). This is our first new bed in 17 years so we were definitely due an upgrade but were nervous about buying a bed online without being able to try it out- the fact SD… Read more ·  1

offered a trial period is what sold us on taking the plunge. We initially tried the medium firmness but I personally found it too firm- SD messaged me to check in and I switched it out for the soft firmness topper (very easy to do with great step by step instructions provided). My husband kept his medium until he felt my side and then he too opted for the soft topper! 10/10 service and communication the whole way through and there was no extra charge for switching out the toppers- would recommend Sleeping Duck to anyone looking for a great quality bed and mattress.

 Follow-up  · The bed frame was easy to install and came with step by step instructions and a video! They offer a range of delivery options and you can even pay for installation if needed.

Scotty
ScottyTAS5 posts
  Verified Mattress Medium King

We were looking for a mattress and a bed frame and I'm sure the indestructible frame would have been excellent- however we decided on a frame from another manufacturer in a style we really wanted and knew was very strong. We were pleased with the… Read more ·  1

frame, but we are still astounded at the quality of the mattress. We weren't sure whether we needed a KING!- but Oh Boy- yes it takes up a lot of room, but it's so nice to stretch out! PLUS and I guess this is what most people are interested in, the mattress itself is fabulous. We went with the firm on one side- medium on the other. I like firm, but I was a little unsure if it might be too firm. IT IS PERFECT. My wife likes the medium, and when I lie on it- I think- yeah I could sleep really well on that too! So far we have turned the mattress once and unzipped the top cover to switch the inserts to the other side- all worked as expected. There was a lot of discussion in forums about not being able to lift the corners to put the sheets on??? What- I don't think that at all. I was prepared to do this if it came down to it- however my wife did it easily! I know the mattress is not a 'budget' offering, but in this case you really do get what you pay for. We are very very pleased with the purchase. Thank you.

 Follow-up  · Since my last review we did decide to swap out the medium for another firm (so we are both on the firm). The process was quick and easy and we paid nothing! I cant speak more highly of the actual mattress and the great assistance of the staff.

Positive reviews

Jamie W.
Jamie W.
  Mattress Medium King

We have had our king size mattress for about 8 years now. When we first got it I thought It was a great feature that we could buy a replacement top foam layer to suit our comfort preference. After sleeping on it for a short while we were both happy with the comfort level and didn't need to change it. Till this day we have not needed to buy any… Read more ·  1

replacement foam layer, do any maintenance or spend any extra. It still in perfect condition and feels as good as the day we bought it. I've always been around 90 to 95 kg since we've owned it and I still love it. They say you get what you pay for well we have got plenty more than what we payed for as the mattress was very well priced for the incredible quality and build, the fact we've had ours this long and it's looking like we will get another 10 years we have saved so much money as a result. Best money we ever spent. We've also moved home twice and it's got convenient strong handles in good positions to easily move and carry it.

Ismini Brown
Ismini BrownVictoria
  Mattress Medium King

We found the medium ideal for us both. It makes us feel comfortable and supportive. My family members have a sleeping duck mattress aswell and they love it! I was impressed with the good reviews and how efficiently the company expedites the order and follow up. Show reply

Bev
BevWA
  Mattress Medium King

Hi guys just wanted to let you know we have been blown away by your amazing customer service when ordering our Duck mattress. The delivery was really fast and we received the mattress in 4 days of it being ordered which was fantastic seeing we live in a rural area. You even followed up on the delivery day letting us know what approx time it would… Read more ·  1

arrive. You also followed up 2 days later asking if everthing was ok with the mattress. Our order was for a half / half mattress with firm and medium inserts ordered. After 2 weeks we found the firm mattress was too firm so after emailing you back, without hesitation you sent a medium insert out via Auspost which arrived in a week. We absolutely love our mattress it is very supportive and super comfortable. We would highly recommend your product and your company to anyone. Finally having such a good sleep!

Find out how Sleeping Duck Mattress Medium King compares to other Mattresses

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Negative reviews

Krunal patel
Krunal patelVIC8 posts
  Verified Mattress Medium King

I wish i could give 0 star… They say it has 10 years warranty but after claiming the warranty they just do the listen to you. We have bought their king size mattress 5 years ago but after few years we found that the mattress is not like it used to be. The foam became very very soft and we started having back pain again. After writing them many… Read more

time back and forth finally we accepted the loss as they keep asking photos and videos. And then when u provide the photos they say we need this. Photo and that photo inshort they harass you so much u quit ur self. The worst customer service ever, when you dont want to listen to the customer then why do you provide the warranty. STOP SELLING TRASH IN THE NAME OF TECHNOLOGY…

Sleeping Duck
Sleeping Duck    

Hi Krunal, we appreciate you taking the time to… Read more

Ayman Soliman
Ayman SolimanVIC2 posts
  Verified Mattress Medium King

I ordered my Sleeping Duck mattress around 6 weeks ago. We didn’t like the firmness, so after just 1 week we requested a firmness change. It has now been 4 weeks of waiting with no delivery. Every time I contact Sleeping Duck support, they give me a different story — first saying the replacement firmness is in the Sydney warehouse and will be… Read more

sent soon, then later saying it’s in the Brisbane warehouse and will be sent soon. Yet nothing has actually happened.

As of the time I’m writing this review, I still haven’t received the firmness replacement. This level of delay and inconsistency is extremely frustrating and very disappointing. I expected much better service.

Sleeping Duck
Sleeping Duck    

Hi Ayman, We appreciate you taking the time to… Read more

Sam C
Sam C
  Verified Mattress Medium King

Not happy with the experience – The mattress has a soft, springy feel topper which seems to offer support up to maybe 5cm. However there is not much give beyond that. If you have broad shoulders, and sleep on your side, you may find it lacking in support. I slept terribly on it. I tried the topper changes, but changing to the soft really highlighted the underlying lack of give… Read more

and support in the mattress. The return process is also pretty difficult. They might say ‘money back guarantee’ but when I asked to return it, they pointed me in the direction of a charity to pick it up. I asked for the return, but Sleeping Duck and the appointed charity didn’t get back to me for around 3 weeks, and then I had to organise the charity pickup, calling them up to set up a time ‘somewhere between 10am and 4pm’. Well ok, atleast it’s gone to a charity, but they don’t tell you the stuff around you have to go through to get your money back. It just seems misleading and disingenuous.

Sleeping Duck
Sleeping Duck    

Thanks for leaving a review about your experience… Read more

Recent reviews

Tony D.
Tony D.QLD6 posts
  Verified Mattress Medium King

We did a fair bit of research pre buying. We were impressed with SD promo material. It stood out from other bed promos which often had a discount - but price was only one consideration. We have had other expensive beds ( $10k down to $6k on special at DJs ) which ultimately disappointed us. We ordered the "firm" mattress. Initially my wife felt… Read more ·  1

it could be too hard, but no issues after a week. We now both love the firm mattress. We were initally concerned about assemblying ourselves, but no issue at all as long as there are 2 of u. The bed frame is incredibly solid and strong. We are awaiting the auto sheet refresh module, which was not available at the time of ordering. Given the weight of the mattress, we consider this is essential to make it easy to change sheets. We highly recommend the bed & mattress at what we consider to be a reasonable price.

John A
John A6 posts
  Mattress Medium King

We did a lot of research before we purchased Sleeping Duck. In all honesty I can say that this mattress really is worthy of its reputation as being excellent. Their delivery arrived fast and early. Their customer service in relation to the purchase and trial period and follow up has been excellent. Lastly we are sleeping so much better since we isntalled it. Thank you Show details ·  2

Trevor
TrevorWA
  Mattress Medium King

Looking for a mattress can be daunting- ask friends of their experiences- Sleeping Duck was the response of course. Checked out company and purchased my King. From the outset the ease in which buying a mattress taken away- professional service from delivery/ follow-up and ease of contact and support is rarely found with companies now days. Needed… Read more ·  1

a mattress that gave me good support as I am a back sleeper, which my SD provide. Sleeping duck, you have excelled. One very happy customer

Alisa
AlisaVIC2 posts
  Verified Mattress Medium King

We recently purchased this mattress for our son and he absolutely loves it. He says it feels very supportive and comfortable, and he’s been sleeping much better since getting it. It provides good support without feeling too firm, and it seems very well made. Very happy with the purchase and would definitely recommend it. Show details ·  1

Sylvia Duncan
Sylvia Duncan2 posts
  Mattress Medium King

We moved our 9 year old Sleeping Duck to our airbnb. It was still soooo comfy, but decided to update to the new model for ourselves. Latest model just as Perfect as previous. LOVE IT! Our daughter also has one and so do her 2 young kids. All of them love it too. So 5 reviews in 1!! And All 5 star Show reply

Steph Grady
Steph GradyQLD
  Verified Mattress Medium King

It’s what dreams are made of! Comfiest bed i’ve ever slept on! It’s like sleeping on a cloud! Don’t even feel my husband move in bed! No longer wake up sore and achy! I never want to get out of bed! Show details ·  1

Find out how Sleeping Duck Mattress Medium King compares to other Mattresses

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Katie Williams
Katie WilliamsNSW
  Mattress Medium King

My previous mattress was giving back issues so i bought this new Sleeping duck mattress and i cant be happier. my back problems are gone and the mattress is so comfortable I dont want to get out of bed. Show reply

Trish
TrishNSW
  Mattress Medium King

Best mattress I have ever slept on. I am a side sleeper & it is so comfortable, I am sleeping extremely well. Bought a Queen size for my daughter a few years ago & promised myself I would eventually buy one for myself. Absolutely no regrets. Show details ·  1

Bobbi
Bobbi9 posts
  Mattress Medium King

I've found the mattress to be very comfortable allowing me to get a deeper sleep for the short periods that I do sleep. Unfortunately it has not helped my back problem/s. However I am not disappointed. Show details ·  1

Steve P.
Steve P.
  Mattress Medium King

We’ve had our king size Sleeping Duck mattress for about 5 weeks now and it’s been excellent. All our dealings with the company have been great and the mattress itself feels and looks very premium and was delivered to us in the Southern Highlands, NSW, within 48hrs of purchase. I’ve got a number of old rugby injuries and have found the combination… Read more ·  1

of medium softness and coil spring support to be amazing. It’s definitely better than previous mattresses we’ve had most of which cost a lot more. I hope the company continues to do well. It’s a great product and, so far, excellent quality.

Mike C.
Mike C.QLD
  Verified Mattress Medium King

We tried a bunch of mattresses in showrooms etc but this was so confusing! It was hard to tell the difference between them in the 10 min you get to lie on it in the showroom. One of the attractive things with SD was that it was adjustable. We initially chose a firm mattress but when it arrived after the first night it was not ideal. One quick… Read more ·  1

phone call and the medium kit was on its way and a couple days later we were able to change the mattress firmness. It is now perfect for us. I really like the peace of mind of being able to change it after the fact in case it is not quite right.

Customer service was top notch and delivery time was very quick.

Marie M.
Marie M.WA4 posts
  Mattress Medium King

Best mattress I have ever had Very comfortable and supportive Had a positive effect on my sleep Yes has maintained shape and firmness Thank you Sleeping Duck ❤️ Show details ·  1

Jennifer Polesso
Jennifer Polesso
  Mattress Medium King

New mattress is extremely comfortable. Initially I had neck pain as the end of the mattress seems to be lower, but after purchasing a higher profile pillow, all is great. Show details ·  1

 Follow-up  · Once I purchased a high loft pillow, everything was fine.

Jordan H.
Jordan H.VIC2 posts
  Verified Mattress Medium King

Absolutely amazing. I have struggled with sleep for years. I have chronic pain and also am just a terrible sleeper waking up multiple times a night. I never struggle to get comfortable. I fall asleep almost immediately and even when I wake up, I fall asleep so quick. Show details ·  1

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