This mattress is the most comfortable mattress we have purchased.  We are now purchasing all new mattresses for our lake home.  They will all be the same and great for our guests.  Very easy to unwrap and although ours has not fully expanded it is measuring at 11.5".  I am sure by morning (after we let it rest over night and) it will be the 12" as described.   By far this mattress is well worth the money.