Apparently looking at the reviews, some are good and some are bad. Mine is bad, I got a queen size topper. I see 2 layers. Some 2 inch standard yellow foam that easily squishes down to nothing when pinched. There is also some greenish type of memory foam about 1 inch, but far from High Density in my opinion. That's not the worst of it though. The center of the mattress is compressed. The memory foam never raised. It comes vacuum packed in a plastic bag folded up into thirds. Like a sleeping bag. I opened it up and laid it out for a week before sleeping on it giving it time to expand and"rise". (generally 48-72 hours). It was still flattened out in the middle. I thought maybe it needed some help in it's rising. I decided to try and sleep on it for a week. Hoping to break it loose. Release it's hold and rise up, especially in the middle. It is still flattened out and squished. Perhaps they come from different manufacturers. It is not as I hoped it would be. Good luck in trying to squish it bag to send it back.