I bought this as I have a trundle bed and needed one more mattress. I wanted to try the memory foam as I have memory foam on my regular bed and really like it. Many people did not get a pillow. The pillow in mine was stuck to the mattress and flat as a pancake. It is still flat as a pancake. So if you are buying it cuz it has a pillow. Just buy the mattress w/o. It's much better.That being said. My mattress is very nice. It puffed up very well and I have a very expensive memory foam and for what this is the quality is very nice. I don't know if it will be on top of the day bed or on the bottom. Have to play with both places but it fits either area.Also, it comes with a nice cover on it but I recommend getting a waterproof cover for the mattress as well. I have done this with all my beds because you never know who might spill something or their dog might have an accident and you would have to throw it away if this happened. They are way worth it.