This mattress is very firm, but not hard. The memory foam has just enough give to make this mattress feel comfortable but your spine alignment will remain straight. I have a bad back and hips. This bed supports my back but has just enough give that I can lie on my side without my hips hurting. I did not notice any weird odors, but I do have a dust mite cover on it. It was fun to watch it expand when I unpacked it. If I need another mattress, I will not hesitate to repurchase.

The twin size mattress arrived promptly in a large box. It is made in China. The shipment was lighter and the box considerably smaller than if the mattress had been an inner spring with steel coils and frame. The mattress was partially compressed in a tight roll in a sealed poly vacuum bag with much of the air removed from the foam. Then the roll was further packed in a sturdy cylindrical white plastic outer bag with a draw cord tie, before being slid into the box for shipment. Unpacking was the reverse, following the step-by-step picture instructions. As soon as the mattress was rolled out flat and the inner poly bag was opened, air began to rush in and fill the foam, expanding the mattress. I ordered the 8" thickness and the fully expanded mattress was almost 8 1/2" thick. This took about 48 hours, per the instructions. The result was a medium-to-firm mattress with the top layer of "memory" foam conforming to the body. After unpacking, there was an odor from the foam that I would describe as like latex-based paint. Although people vary in their reactions to odors, I would judge the odor to be rather mild, certainly not as intense as painting a bedroom with latex. Allowing the mattress to air for the prescribed 48-72 hours dissipated the odor to the point that I found it unnoticeable. One thing I didn't see in the description on the Sam's Club website (perhaps I missed it): The Night Therapy Memory Foam Mattress is not intended to be used with a foundation, such as a box spring. It is intended for a platform or bunk bed. I am using it on a captain's bunk with a continuous firm plywood surface, which works. Also, the mattress cannot be turned over with each sheet change to even out stress. The top is the top, the bottom is the bottom. The mattress can be rotated with each sheet change, head to foot. All in all, a nice quality-made foam mattress reasonably priced that gives a comfortable night's sleep. I would have given it 5 stars, but would like to see how it performs over time. So far only one night on the new mattress.

After reading all the positive reviews we decided to buy 2 for a bunk bed set. Our 2.5 year old has been sleeping on one for the last couple weeks and he loves it. Prior to sleeping on this mattress he was up at least once a night and now he sleep right through the night. I read some comments about the smell when the mattress gets unpackaged but I didn't think it was an issue at all. Very good quality and value that is tough to beat--I wish they were available in store and not just on line.

I researched thoroughly before puchasing and chose this one on foam density and price. I already had a 2in memory foam topper that is now on top of this mattress. The only bad thing I have to say is that it is a little too big and since I have a platform bed, it is hard to tuck-in the sheets and blankets.

Never expanded all the way after taking it out the box

It was just too soft. I kept sinking down in it.

Quick shipping. Expanded correctly and very comfortable mattresses for my girls' bedroom

My son loves it, says it's so comfy. Love these mattresses!

we have bought 5 over the past few years and are verry happy with this matress

The thickness changes by about 2 inches at about the halfway point from the feet to head section.