This foam topper was exactly as described.  I left it on the bed for 48 hours before I used it.  I covered it with it's own mattress cover then put an additional mattress cover on top of that because the edges of the foam will shred a bit when handled. I wish it came with it's own cover to enclose it like others I have purchased.  I did not find that there was off gassing from it.  I would purchase this again.