When it was delivered it came compressed and rolled. It is heavy. Once I cut open the plastic that kept it compressed, it easily opened up to its shape. You do sink in when you sit on it but keeps a balanced comfort when you lie down. It is firm, which I was dissappointed at first, but it contoured my body that it eliminated all aches and pains that I usually get when using the spring plush mattress. Also, your bed mate will not be bothered by movements. It is described exactly as advertised and a great quality for the price.