ESTELIN Retinol Anti-Wrinkle Serum Mask SheetsEach sheet mask is drenched in a concentrated serum that features retinol (a well known vitamin A derivative), formulated to target signs of ageing such as fine lines, surface wrinkles, loss of elasticity, and dull texture. When you apply the mask to cleansed skin and leave it on for the specified time, the serum works to penetrate the skin surface and support renewal processes helping the skin appear smoother, firmer and refreshed. The sheet format