Klairs Midnight Blue Calming Sheet Mask 10pcsDescription Soothes irritation with willow bark and centella asiatica extracts Lowers skin's temperature with the help of erythritol making it a sunburn saviour ! The sheet mask is made out of bamboo charcoal to draw out impurities from pores, which is perfect for those with large pores Suitable for oily skin and skin that frequently undergoes facial extraction Usage 1. Before opening, lightly rub the packaging to saturate the sheet with the essence.