Like most I had to laugh when the mattress showed up at my door in a box not a quarter of the size of a king size mattress.
Opened the box,laid the mattress on my box spring and punctured one end of the bag it was in. It slowly filled with air and before I knew it I had a kind sized firm mattress.
I have read the reviews on this item and I have to say those of you who say it is not firm are wrong . I sleep only on firm mattresses and this one is great .That little pillow top is exactly right for this bed . Makes it comfortable but not soft .
I have slept on it for a week and so far no problems whatsoever. The price makes t even more desirable. I paid over $1000 each for the last two mattresses I owned. Neither held their shape they sagged horribly . This mattress at this price cannot be beat .