The Regeneration Circulation Mask is a wash-off mask. The biggest advantage is that it allows you to take care of your skin at home without having to go to a special clinic. It comes in a really large size, like something you would see at a clinic! My skin has been rather red and sensitive these days, so I tried the mask on the back of my hand. It passed the sensitivity patch test. so I felt it would be safe to use. As soon as I put it on the back of my hand, it felt cool and moist! After washing, I can definitely tell that my skin has become brighter!