Which side goes up on a Abolute Comfort memory foam 3 sculpted mattress topper?

I have one and although the directions are not specific, the photo on the box shows it with the eggshell or bumpy side up and that's how I put mine. I believe this is correct and is to allow airflow and cut down on making one feel "hot" when sleeping on memory foam (something I've read about but so far have not had a problem with.) Hope this helps.