I bought this style specifically because it is smooth on top. I wanted to try something other than the typical 'egg carton' tops. The memory foam that comes with it made my decision easy. The memory foam comes folded up and pressed flat so when the package is opened and the foam is laid out flat.....it doesn't lay flat:) It is covered in sharp creases that would be impossible to sleep on - if used immediately. I found out that patience is a virtue. I laid it out on the floor and after spending days stressing about what I would use instead of the foam that would be comfortable for my guests, the foam smoothed out by itself. Took almost a week but it looks fine now. The zipper used to attach the memory foam to the bed won't last long if at all.