Best ~1000 Won sheet mask, I've use so far. The sheet it made of a thin, but cotton-like material. The mask liquid is slightly viscous so that it doesn't evaporate too quickly. I typically leave it on for about 30mins, then take it off. The sheet mask so great that you don't need to use it everyday. I have Sahara desert like dry skin, yet I find that I only ever need to use it twice (maybe 3 times) a week. I find that the mask is also great for sensitive skin, because it doesn't have a scent to it.