There are three different packs available for the Etude House Sleeping Pack. Blue (brightening), green (oil control and pore tightening) and pink (moisturizing and firming). I tried out the pink one, as I also had other sleeping masks and wanted to compare. Sleeping masks are fairly straightforward. They are used at night either in place of a night moisturizer or applied after the night moisturizer. It works while you sleep. The next morning there wouldn't be a greasy feeling, but I felt that it needs at least 9 hours in order to be fully effective. Whenever I wash off the mask before the 9 hours are up, I find that my skin is not as moisturized as it should be. I certainly believe that there are better sleeping masks out there, such as Laneige and Bio-Essence. So for this sleeping pack, while it is fairly cheap (S$22.90), I would not repurchase it since there are brands out there that could give me a much better result.