What it is: Our Master Lab Sheet Mask Collection features an ultra thin hydrating sheet mask made of natural cellulose for even and consistent absorption of active ingredients! Each Mask features a customized formula that targets specific skin concerns. What it does: Unlike conventional sheet masks made with cotton the nude seal technology used in this collection features a ultra thin skin-fitting material that comfortably clings to all facial contours for effective delivery of the concentrated serum. Product Options Available are as follows: Option: Ceramide - Tony Moly Master Lab Sheet Mask; Option: Vitamin C - Tony Moly Master Lab Sheet Mask;