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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

1,623 reviews

Positive vs Negative
98%2%
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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
4.9
5 Bek  · The most comfortable mattress we have slept on! My husband has had two back operations and this mattress has been perfect for him!
5 Martin Simmons  · Everything we expected and more. You have two happy clients
5 Cecil MacDonald  · Awesome comfort and great support. Assembling the base was clear and easy to follow.
5 lynjim  · I sleep like a log. I like that I can remove the top and put it through the wash.
5 Daniel G.  · I feel very satisfied with the purchase. Is what I expected after reading many reviews.
5 Stefan  · perfect night sleep from the first night and every night since. Have had a friend sleep on it for several weeks while i was away and they have loved it too

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

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.

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.

Positive reviews

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

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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

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

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

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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

yes
yesNSW11 posts
  Mattress Medium King

Well I watched adds on TV . I was looking around for a mattress for our BNB. I purchased an EMMA mattress. I found sleeping on the floor more comfortable. BUT THEN I PURCHASE A DUCK .Best mattress and best sleep i have ever had . Again don't be fooled by fancy t v adds ............DUCK BEDS ARE THE BEST U WILL EVER SLEEP ON . I tried for several weeks to get my money back from EMMA good luck if you try Show details ·  1

pdtant
pdtant2 posts
  Verified Mattress Medium King

Best thing we ever did was to switch to a Sleeping Duck mattress. We both get a much better night's sleep and wake up without aches and pains. Mattress is one of the most comfortable we have ever slept on. Show details ·  1

Ian
IanWA3 posts
  Mattress Medium King

I have this mattress for nearly 3 months now and I am Still having the best and complete sleeps l have in years, to the point that in the morning I do not want to get out of bed, it truly is the best mattress I have ever had. Ian Show details ·  1

Joan Walker
Joan WalkerSA
  Mattress Medium King

I ordered the sleeping duck mattress after doing some research online and trying to find some bad reviews to see what the people who weren’t happy with thier Sleeping Duck had to say. I couldn’t find any. I found loads of reviews for happy customers, so i decided with the ability to be able to return the mattress or customise as needed, that i… Read more ·  1

would order one. Even the Delivery guy has one and loved it to! Both my husband and i are very very happy with our mattress, sleeping well, ordered the medium and feel no need for any adjustments. The Price was great and the delivery was easy and unpacking was also easy. So far we are very satisfied with our purchase and have and will recommend them to anyone

Pauline
PaulineNSW3 posts
  Verified Mattress Medium King

This mattress is the best I’ve ever bought. I wake up with no aches or pains and I don’t hobble around in the mornings. I haven’t slept this well ever. Would highly recommend Show details ·  1

Ian Alexander
Ian Alexander
  Mattress Medium King

Very pleased with the prompt delivery. Bought 2 mattresses, one firm and one medium. Both provide a good level of comfort and support. We both have health issues (neck, back, hips and thighs). My wife can now sleep on both sides without the intense hip pain while I have been sleeping soundly overall, albeit with some pain in hip and thighs if I… Read more ·  1

stay too long in one position. Easily resolved by rolling over. The mattresses have maintained the shape and firmness expected, but this is over a relatively short period of time.

Melanie Morse
Melanie MorseVIC
  Mattress Medium King

This is my second sleeping duck mattress, I now have a Queen and King. The mattress is the best I've slept on, service and support is second to none and price extremely reasonable. Sleeping Duck are incredible. Show reply

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