My son was complaining that his mattress was awful. Since it is not too old we did nto want to buy a new one. We found this memory foam for a much more reasonable price than we found locally and decided it was worth a try. My teenage son loves it- he has not complained once since using it! I was disappointed when I pulled it out of that tiny box- never had memory foam before- but within anhour the size and shape perfectly matched the bed and my concerns were gone.