I would buy the same brand, a pocket 800 mattress, rather than this one. I read the comments; it seemed ok with this one, but it isn't. It came as a roll. You can touch the springs on the sides when placed on the bedframe. I fell/slipped down to the floor when I sat on the edge of the mattress! It is too soft and lacks support. I returned it before someone got hurt and then bought the 800 one. It is much like a real mattress. 
The Wayfair service is good with the collection and return of products. For the service, 5 stars; for this mattress, I think I just understood the meaning of 'essential' - which means 'basic' or 'it looks like a mattress. I hope this review will help people who want an actual mattress avoid the hassling - buy, return, rebuy.