It is as advertised and it puffs up to the full 4" as advertised and does come with a zippered cover which is nice, but it does move on the bed somewhat because it's a mattress cover, not a mattress pad. It is fairly easy to adjust, just pull it back where you want it every few days. It is comfortable and you sink into it as it cradles your body. As others stated in their reviews is that it does smell at first, but the smell does dissipate. If you can leave it uncovered for a few days before use, it will help with the smell greatly. I didn't have that option, so I just unzipped it most of the way the first couple of days and it helped a lot.

So far, we are satisfied with this topper and hope that it lasts for a good while..Must say that is was difficult to get the mattress protector onto the foam topper..Instructions were vague on how to do this....Our topper is a king size and somewhat hard to handle it. I decided to place the mattress protector upside down on our bed and then we placed the topper onto it ...then zipped the whole cover...

It did not open completely, only half of it. The other half stayed flat. I bought it around 10 days ago and as of today it still has not opened the other half. When opened the box it came in, i laid it completely flat on the floor and left it there as it says for 24 hour. But after 10 days it has only opened half of it.

We bought this mattress topper to add some comfort for our RV queen size mattress. Had only mild foam odor when opened… the smell dissipated after one day of leaving the windows open. The to[per is fairly soft and added Great Comfort to our existing mattress. I would highly recommend!

Guest's complained their bed was really hard. Mattress was seldom used and fairly new, so thought i would try this pillow top. Guests love it! One who previoudly complained asked for info so he could purchase one for his bed. Definitely made a big difference for reasonable price.

I bought a twin size for our pull out guest bed our daughter tried it out and liked it so much we bought one for her full bed. She loves it and really likes the cover that comes with it. We have had both for a month or less so can't answer how they will hold up over time.

Do not buy...toxic smell, awful to lay on, even after a month. The smell was all over me, my blankets, clothes, even folded clothes that were in my room. This product should be illegal to sell, it is titanic waste of money. Serta should be investigated, and so should Sams for carrying it. I’d give it -5 stars if I could. Worst product ever. Like laying on a toxic landfill. It’s like a cancer mattress. Awful.

When it came, it was very cold here, so the topper took a minute to puff up. It was shipped compressed. After laying it out, the fit was too big because I got a queen size instead of a full. But I kept it. Very comfortable. Not too much smell, then there was no smell after it aired out and puffed up.

This was the perfect solution to a mattress that was too firm for us. It’s made our bed so comfy to sleep in now. Cover is easy to take off and launder. The cover also grips the mattress it’s on so the topper doesn’t slide around. We had no problem with any odor coming from the memory foam either. Overall very happy with this purchase. If you don’t want cushioned softness, this is not for you at all. But for us, it’s just the right amount of cushion and we love it.

I expected more from serta. Basically only feels like regular foam.