My new memory foam mattress arrived on my doorstep in only 2 or 3 days. I was able to get the box upstairs to the bedroom by myself (it's not light...I pushed it up the stairs). I opened the box and followed the simple instructions to remove the first layer of plastic...it started to unfold...I put the bundle onto the bed...carefully removed the second layer of plastic...it hisses a little as the air starts to come back into the package. By the time I had all the plastic off, the mattress had already mostly regained its shape. There was a faint foam smell, but not bad at all. I gave it a day and then slept on it the second night...it's SO comfie! When you first lie down, it feels almost too firm, but within a couple seconds, it molds to your body perfectly. I have had excellent, pain-free sleep on my new mattress. (I also use a memory foam pillow.) One unexpected benefit...it has that perfect firm, square shape all the way from edge to edge. It's almost like having a bigger bed!