Initially this mattress topper feels comfortable, provides reasonable support.  But within a few minutes it compresses under you so that it is almost flattened against the mattress, and it gets hot, both under you and next to you where it is not compressed, so that it is worse than useless.  While nominally this product might have been returnable, this would be impossible once it's out of the box and expands to full size. This morning I finally put it out for removal as trash.  Hard to imagine how it passed the supplier's quality testing, if it had any.