When the mattress arrived it was folded in half , rolled up, and compressed in a box. Most customers like their Zinus mattresses for their initial comfort, but there were some that reported issues with longevity and heat retention in some models.If you are concerned about long term comfort, take a look at our list of top rated mattresses. I gave this 5 stars because after a week of soreness in my back and neck, this sucker took it right out after a good night's sleep. It's very comfortable, my daughter picked it over her older traditional mattress which she had for many years and loved. It was like it was never desperately stuffed into an awkward shape.On that note, since this is a memory foam, I love the homogeneity of this mattress compared to spring mattresses. So, I contacted customer support. But regardless for the price, it is a good mattress and I'd probably buy the thicker one soon and maybe put this 8 inch in a sleeper sofa for when family comes to visit.. Comfort® Foam used in the Zinus is CertiPUR-US certified. Horrible! I also didn't let it inflate for 3 days like it says...I got tired of sleeping on a blankets on the floor so I decided to just sleep on it after like one or two days. I learned that Imlike a plush feel on top of a bed with responsive spine alignment. I am now buying a topper and a plush pad to add a few inches of softness so that I will hopefully retain back support but add that luxurious feeling. I used the first mattress for two years at least and I am 140lbs and have no complaint, the mattress is still good and will be used in my guest room. For this price, I would have gotten a horrible basic innerspring mattress that would have only lasted a year. No, I would have to say that there are definitely better mattresses out there for a significantly higher price. And, now that I have figured out that I can lay on the sofa with no problems, this confirms that the problem is the foam mattress and not me.Update #4. Some spots are 9" in height. The instructions are flat out wrong - it shows up folded in half and upside-down before being rolled up. On a scale of 1- 10, with 10 being the firmest, the Zinus 12-inch Performance Plus is at 8.5. It was delivered in a box, well not use to seeing a mattress all fold up in a box. Its very comfortable for sleeping. That is how I sleep and usually in the morning I wake up and my hips are in so much pain, but no more!Just as a testament to how comfy this bed is...my son decided to climb into my bed in the middle of the night the first night I bought it because he wanted to sleep on the new bed. I bought a memory foam pillow a few months ago at Belk. We estimated that the 8" would contort a little better with the adjustable bed, but Zinus was (and still is!) Above their pocket coils are layers of foam or a pillow top. There is NO additional price markup for using this site or on links from this site and any commissions made by Slumber Search come out of the brand's profit margin. After I opened it, the mattress quickly expanded. Still best decision I've ever made in terms of beds.Update 12/7/2015 - A whole year and four months in, still the best bed I've ever slept on. Perhaps this review will help you.....Details: I am 5'10", 268 pounds, stocky, and was recently not-exactly-diagnosed with sleep apnea. You don't even need a pillow. It came upstairs with little fuss (it was heavy, but not too bad), and we opened it up. Zinus recommends opening it within 72 hours of receipt. Trust that I have done this research for you and you need not look any further! My dad got me this bed when I moved into my first place on my own. Others caution you to have the mattress at least near where you will ultimately sleep on it before you unwrap it. I hardly sink in the mattress at all. 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