BOOTS VITAMIN C BRIGHTENING SERUM SHEET MASK 20ML brighter skin within 7 days* deeply nourishes for smooth and radiant skin With 2x vitamin C and YUZU extract, Boots vitamin C brightening serum sheet mask helps nourish deeply for smooth and radiant skin. Each mask contains the amount of one week of serum. Skin looks brighter within 7 days*. Ultra thin skin-fitting material that comfortably clings to all facial contours for effective delivery of serum.