What a fabulous mattress, it arrived rolled up in a box, when released from the plastic wrapping it expanded into a full 4" 6 mattress.  I left it to breathe for a few days, as instructed, and this morning my daughter said that she had the best night's sleep ever.  It is quite soft but firm enough to keep from sinking too far into, probably because of the memory foam topper, I wish it was on my bed.