The king sized "green" mattress pad is extremely comfortable. I find I can lay on my back all night and wake up in almost the same position, it's akin to floating on water bed. The pad does smell, and no, it won't go away, "in a couple of hours." We allowed the pad to air out outside propped on folding chairs for a full day, then we found we had to pull back the sheets, open our bedroom window & run the ceiling fan for several days afterward to fully get rid of the smell. After day 4 it was gone. The pad was VERY difficult to unwind, it is compacted tightly. You will need a friend to help you and be prepared to laugh hysterically as you nearly fall over trying to get it unwound! Our pad began to show some yellowing the very first day but I did some research and found out that was oxidation and is normal. So far we have had it two weeks and are absolutely thrilled. It was tempting to buy a less expensive pad, but we're trying to be eco-conscious so I hope this pad is as "green" as advertised. It did not come with any manufacturer informational packaging.