I very rarely write reviews (although I should), but I had to for this mattress. This is hands down the best thing I've ever bought on Amazon, and trust me, 90% of everything I buy comes from here. I love this mattress so much I swear I've become a pseudo brand rep for this company. For the first week it was all I could talk about. When we starting shopping for a larger bed, I did A LOT of research. I looked for weeks and thought it was too good to be true when I found this online. I was also nervous because I've never bought a mattress without testing it in person, let alone one that comes rolled up in a box. My boyfriend is also very particular and likes a really soft bed while I like mine more firm. But let me just tell you, this mattress is everything it promises and then some. I kid you not, it is the most comfortable mattress I've ever owned. It is the perfect combination of soft yet firm. The fabric is so soft you could sleep on it without any sheets. You literally sink into the top like clouds. I'm not sure it's possible, but my boyfriend might love this bed even more than I do.

The mattress came rolled up and vacuum sealed in a box to our door. It immediately plumped up as soon as we took it out of the package and there was no smell whatsoever. On the packaging it says to give it at least 48 hours to plump up to it's full size, it didn't take anymore than an hour to be the full 12 inches. This mattress also comes with a warranty which is incredible.

We also bought our new bed frame from this company and it is just as incredible. Super easy to put together and really sturdy.

If you never buy anything off Amazon again (which you would be crazy for) you need to buy this mattress. Do not spend an absurd amount of money on one at the store. You won't regret it.

Photos below are before we received our Zinus bedframe which is just as amazing as this mattress.

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Hopefully this review will help you decide between a Leesa memory foam and the Zinu Ultra.

Two years ago I replaced my conventional spring mattress with a Leesa. I had a coupon for Leesa and got their 10" mattress for around 600 dollars.
To be honest, I downselected between the Casper and the Leesa and instantly wished I had gone with the Casper. The Leesa was hard and never expanded to the full 10 inches although it did make it to 9. I slept on the couch a lot because it was more comfortable and the wife kept slugging it out on the Leesa. I must admit, after about a year the Leesa actually got much softer and more comfortable so in the long run, I have no huge complaints.

About two months ago a friend of mine pointed me in the direction of a Zinus. After I saw how cheap they were I fifured if it wasn't better than the Leesa then I would cut it up and use it for archery practice. I received the king mattress and I also bought the Zinus deluxe king bed frame. I opened up the mattress and let it expand for 3 full days. It actually took that long to make it to 12 inches. The Zinus is a full 3 inches thicker than the Leesa and it makes a huge difference.

From night one I was extremely pleased. It is like sleeping on a cloud and is waaaay softer than the Leesa (even after beating the Leesa into a softer mattress the last couple years). I waited two weeks to write this review to make sure nothing happens in a short time and also to make sure I wasn't going to write a spontaneous review. After two weeks, I am still extremely happy with the comfort and excellent sleep it provides.

In summary, if you want a very firm bed, the Leesa is the better choice. If you are a side sleeper like I am, I would avoid the Leesa. The Leesa is also lower quality and more than twice the price. Don't let the price difference fool you into thinking Leesa is therefore better, it is worse if you seek a cloud to sleep on.

The reason I gave it 4 instead of 5 stars is because I have slept on "slightly" more comfortable mattresses in my life. But those mattresses cost over 2500 dollars and should not be compared to a 200 dollar mattress...and are not worth 2300 more either.

I will add one last thing. I almost did not buy this mattress because of many reviews stating this mattress is hard. Wow, these people have a way different concept of hard than my wife and I do. If the Zinus was much softer, I'd sink to the bottom and hit the frame! I would definitely recommend this one with the pillow top over the Leesa like green tea one. But that is pure speculation on my part based on reviews and foam composition.

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I received the mattress, unboxed it and let it sit on the smartbase that I also purchased for 72 hours untouched.
The mattress looked pretty sad immediately after unboxing and setting it out on the base. After a couple of hours it looked quite a bit better and I had good hopes for it. However, after letting it sit undisturbed on the base for a full 72 hours, it still did not decompress to anywhere near 12 inches.
Despite that, I had waited long enough so I put my new mattress cover and sheets on it and slept on it last night.
Cloud-like? Not so much...I'd call it a medium mattress at best. When you first lie down on it, it doesn't feel like it gives much at all. It feels pretty firm. After a while, maybe due to body heat, your weight etc, you do sink in somewhat but I definitely wouldn't describe it as "cloud-like".
I had a mattress cover and a fitted bottom sheet on the mattress and I was surprised at how hot I got while sleeping on it. I slept OK...not great and I still woke up like normal with back pain.

UPDATE: After sleeping on this mattress for almost a week now, I decided to update this review...lowering from 2 stars to 1.
I bought this mattress because I read that it was great for side sleepers...it's not! I toss and turn and re-adjust all night long trying to get comfortable on my side. I sleep on one side until my back pain, shoulder pain, hip pain, knee pain and my arm falling asleep forces me to switch to my back or my other side. It does not relieve pressure at my pressure points as I had hoped it would. I feel like I need to buy a separate foam topper for this mattress. I have a crappy, inner-spring RV mattress in my RV that I bought a 2" foam topper for and it is more comfortable than this mattress.
If you sleep on your back, this mattress might work for you but side sleepers...keep looking.

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After being left to "inflate" for 4 days now the mattress will not fully expand. You can still clearly see where it was folded into the box. I have the green tea model from them in my guest room and it is great, will be returning this one for a second green tea model.

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UPDATE: Been over a year, and we still love this bed! Came back to this page and as I was recommending it to a friend!

This mattress is excellent. I was SO anxious after I had ordered this and when waiting for it to arrive I found myself down a rabbit hole of reviews. I'll address the big ones that stuck out to me:
1) This mattress does NOT have a "toxic smell". It does smell, like a brand new mattress, so it's not odourless per se, but I don't think any mattress or anything made of brand new materials is completely odourless. I have a VERY sensitive nose (think pregnancy sense of smell, minus the pregnancy) and I noticed this only marginally. It was gone within the next hour or so, as I even left the house and returned and didn't notice a smell.
2) This mattress inflated SUPER quickly! I opened it up and was scared that it was going to stay the way it was, and was delighted that when I returned home a few hours later and it had puffed up. I also read on Zinus' website that they encourage people to sleep on the mattress as it puffs up, so don't worry about sleeping on it if it's halfway there.
3) I think this mattress was a bit under 12" - probably ended up being more like 11 - but it's more than thick enough. The corners also inflated evenly.
4) In terms of the firmness comments, this is very relative. I LOVE this bed, and my husband and I have had the best sleeps so far in it - but that is really relative to how you like your bed. I would say it was a more firm, memory foam style bed. You don't get sucked in, but you also don't feel like you're sleeping on a wooden bench. It honestly feels "just right" to me. Even my cat has found her new favourite sleeping spot (it's under the duvet after the bed has been made, all day, while we're at work).
5) You seriously cannot beat this price point for the quality. My aunt recently bought a Novus bed (for a few thousand dollars) and this bed feels the same (but arguably, better!).
6) If you're looking to work on becoming more of a morning person, I do not recommend this bed, as you will never want to leave it.

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Arrived yesterday, and was sleeping on it 2 hours after removing it from the box. Very comfortable. I can't believe some people thought it was too hard?! It has a nice stitched top layer that acts like a "pillow top". No motion transfer. I slept the whole night through. There was a slight odour initially that was gone by morning. So glad I bought this mattress. Can't beat the price!! * It’s now September and bed is still super comfy. It hasn’t sagged. There is still no motion transfer when flopping around. Love this mattress. I put it on the Zinus platform frame and it hasn’t moved an inch. *its now been a year and still super comfy. I’ve noticed a little “rounding” on the sides but it feels like the top layer that’s rounding and not the base foam layer if that makes sense. Still glad I purchased it!!

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EDIT: New Review 1 Year After Purchase.
DO NOT BUY THIS MATTRESS!!!! So it has been 1 year and 2 months since I purchased and set up this mattress and it now has over 6 holes in the seams which I have had to sew together in hopes it lasts longer! The return window is only 1 month so I’m stuck with this mattress that is unraveling at the seams...literally!!! What an absolute waste of almost $600. I AM SO UPSET AND ANGRY ABOUT THE LOW
LOW LOW QUALITY OF THIS MATTRESS! Save yourself the disappointment and run away from this and buy a great one from a mattress store now, you will only end up having one do it in a year anyways and will have lost the $600 like I have. I can’t stress this enough because I thought this thing was amazing at first as you can see from my original review below but DO NOT BUY THIS!!!!!

Original Review: Deciding to finally purchase this mattress was tough as all I had to go on was pictures and reviews. As reviews helped me in finally buying this I feel letting everyone in on my experience is the best thing I can do to help someone else who may be struggling with the do or do not buy.

After 1 week of sleeping on this bed I can now confidently say BUY THIS MATTRESS!!! The whole process was smooth and I am so happy I bought this. Delivery was made 3 days after purchase and very efficient. I opened this in a another room and let it air out and come up to size for 48 hours, it reached 11” total so not completely the12” it claims but otherwise it is perfect.

This bed is awesome it is soft while still being firm. I am never disturbed by my hubby who moves around a lot in his sleep, in fact I can’t even feel it when he wiggles around which is a first for me.

If you are on the fence just click buy now because it is totally worth it.

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Once I got my mattress to fully expand, I was so happy with it. Since I suffer from chronic pain and nerve damage, finding a mattress that was comfortable and worked for me was almost impossible. Until I got this one. I am getting a comfortable sleep and waking up without the added pain that I used to get from my regular mattress. I would highly recommend this mattress for so many reasons, with comfort being the main one.

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better than what i thought it would be, i'm a side sleeper and was worried about my side being sore. i was 100% wrong, perfect for a side sleeper